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#1 |
Registered User
Join Date: Mar 2018
Location: Fort Wayne
Posts: 106
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trouble shooting opinions
Finally to the point where I can focus on trouble shoot some electrical gremlins. 1968 C10 stepside. 307 4 speed.
I'm getting ready to work on some electrical issues this weekend. Before I get to it, I thought I'd throw it out there and see if anyone had any opinions. Here's the problem. Turn signals don't work front or back. New tail lights only work on driver's side but not on passenger side. License plate light works fine. New rear wiring harness for new rear tail lights. No lights at all on passenger side rear. I'm guessing a fuse might be the turn signal issue (that big silver guy in the corner of the fuse box). I can only figure it's a bad wire between fuse box and new rear wiring harness. |
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#2 |
Registered User
![]() Join Date: Apr 2017
Location: Boise, ID
Posts: 856
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Re: trouble shooting opinions
It sounds like it might be a grounding issue. Check all the grounding points and clean them up and replace if necessary. It’s tedious, but that’s the most common issue on these trucks.
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1968 GMC C2500 Long Bed Fleetside |
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#3 |
Registered User
Join Date: Mar 2018
Location: Fort Wayne
Posts: 106
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Re: trouble shooting opinions
I will definitely be checking that out. Guess I'll start at the tail light and work backwards. Thanks
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#4 | |
Registered User
Join Date: May 2013
Location: Post Falls, ID
Posts: 889
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Re: trouble shooting opinions
Quote:
Grounds, grounds. grounds check/replace fuses inspect and repair any molested wiring. replace all the bulbs, clean and grease (di-electric grease)all the sockets. Oh yeah and clean up every ground you can find. Seriously, all of them. the whole truck. |
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#5 |
Registered User
Join Date: Mar 2018
Location: Fort Wayne
Posts: 106
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Re: trouble shooting opinions
I could see how it could be a grounding issue for the tail lights but if the turn signals don't work (front and back) .....are you guys thinking a bad fuse in the fuse panel?
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#6 |
The Older Generation
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Location: Montezuma, Iowa
Posts: 25,490
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Re: trouble shooting opinions
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#7 |
Registered User
Join Date: Mar 2018
Location: Fort Wayne
Posts: 106
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Re: trouble shooting opinions
thank you
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#8 |
The Older Generation
![]() ![]() ![]() Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,490
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Re: trouble shooting opinions
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And here is a good thread on turn signals. http://67-72chevytrucks.com/vboard/s...d.php?t=712235 LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#9 |
Registered User
Join Date: Feb 2011
Location: Parkville, MD
Posts: 1,024
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Re: trouble shooting opinions
For troubleshooting lighting issues - Get or make a test light. Read the schematics. Follow the circuit end to end, finding where it stops working.
http://outintheshop.com/faq/wiring/w...s/image002.jpg http://outintheshop.com/faq/wiring/w...s/image003.jpg
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1970 C20 Custom Camper - 350, TH350 1997 GMC Suburban 1994 Acura Integra GSR 1987 Dodge Daytona Shelby Z |
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#10 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: trouble shooting opinions
Do the 4-ways work? Did you try a new flasher?
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#11 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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My suggestion is start at the steering column and work your way back to the tail lights. Check the turn signal connection where the u shaped connector is. Then if it has power start looking at the new connector you installed. Check it with a test light with each light on and then with all of them on.
If you have a helper who can push the brakes and turn the lights on and off helps a bunch. ![]()
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#12 |
Registered User
Join Date: Nov 2017
Location: JOPLIN MO
Posts: 59
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Re: trouble shooting opinions
I had the same problem and it was a grounding issue
figured it out after I bought 2 turn signal switches
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1962 chevy short and wide 2015 z71 1967 SS Chevelle |
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#13 |
Proprietor of Dale's Corner
![]() Join Date: Nov 2012
Location: Vacaville , CA
Posts: 16,103
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Re: trouble shooting opinions
The big silver thing in the fuseblock is a flasher (there's 2). One for turn signal, the other for the emergency flashers.
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"Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man |
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#14 |
Senior Member
![]() Join Date: Nov 2018
Location: Waterford California
Posts: 2,526
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Re: trouble shooting opinions
A quick inexpensive way to pin point a grounding issue is get you a 20" piece of light gauge wire with alligator clips on each end, one end to the Negetive battery post and the other end to your problem such as e.g. your tail light ground wire.
A small safety pin pushed thru the existing pigtail ground wire with the other alligator clip hooked to it will work. This is assuming your bulb sockets are in good contact condition and bulbs are good. If it lights up/works you have a grounding issue, you can then proceed accordingly. |
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#15 |
I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: trouble shooting opinions
On kind of the same topic but more about the tools for troubleshooting, I recently bought a "power probe". It's basically a meter test light and carries it' own power source. I'm still learning all it's uses but it seems a lot easier than trying to juggle three test tools at once (and finding/figure out which you want to use)
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The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" |
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#16 |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,119
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Re: trouble shooting opinions
I recommend familiarizing yourself with the wiring diagram and where the components shown are on the truck. Remember that half of the circuit is not shown as it is the frame and body parts that make up the negative side of the circuit.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. ![]() RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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#17 |
Registered User
Join Date: Mar 2018
Location: Fort Wayne
Posts: 106
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Re: trouble shooting opinions
UPDATE:
Well I spent some time using all your advice. Here is the outcome: I put 5 new ground straps on with good bare metal. engine to firewall engine to frame front inner fender to frame cab to frame bed to frame Still had same problem. Traced it back to the tail light itself. Wiring all looks good. New LED tail light removed. With the power ON and associated turn signal on, I messed with the insertion point of the LED (much like the old bulb socket) and the light finally came on. Although it was in, it just wasn't making the right contact I guess. Lots of frustration but just ecstatic that that problem is solved and now on to the next thing. Thanks again |
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#18 | |
The Older Generation
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Location: Montezuma, Iowa
Posts: 25,490
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Re: trouble shooting opinions
Quote:
Thanks for following up on this. Many people don't. It will help someone else down the road. LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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#19 |
Senior Member
![]() Join Date: May 2004
Location: Queen Creek, AZ
Posts: 1,005
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Re: trouble shooting opinions
awesome! thx for the follow up also....many times that doesn't happen....
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#20 |
Registered User
Join Date: Mar 2018
Location: Fort Wayne
Posts: 106
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Re: trouble shooting opinions
It's the least I could do. This will be a long and interesting journey with this good old truck. I'm sure you'll see me in the future asking many thought provoking questions. I look forward to the many years of knowledge and wisdom of you guys when I'm cussing like a sailor at this truck during the next glitch.
Thanks again. |
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#21 |
landarts
![]() Join Date: May 2005
Location: Star, Idaho
Posts: 1,363
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Re: trouble shooting opinions
Thanks for posting solution. I had the same issue and it came down to the screws that holds the rear tail light housing to the bed. The truck had a fresh paint job and the housing and screw was not making ground, once that was fixed the lights came on.
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Super Cheyenne aka the "Devil Cowboy" 71 K20 Idaho Edition 69 K10 from the Field 68 Second Chance Fix and Sale 72 GMC 3/4 ton 4x4 K2500 The "Fixrupr" build thread 72 Cheyenne 1/2 ton " FIXRUPR " - daily driver 67 C20 all original paint 71 K20 Custom 4x4 (Idaho Edition) 72 K20 GMC Super Custom 4x4 72 K20 Custom Deluxe 4x4 69 K10 Custom package 4x4 (69 K10 from the field) 72 K10 Custom 71 K10 Custom 72 K20 Custom Deluxe 4x4 72 K20 Crew Cab Project 71 GMC Jimmy CST 72 Blazer 70 Blazer |
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#22 |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,119
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Re: trouble shooting opinions
Good work! All those new ground straps will save you further heartache down the road. And as others have said "thanks for posting your results".
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. ![]() RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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