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#1 |
Registered User
Join Date: Mar 2016
Location: Denton, TX
Posts: 14
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Dash Suggestions and Questions
Hi Gents,
So I will try and keep this short and sweet and to the point. I am working on a 1964 GMC short bed fleetside pick up. It has been in my family since it was new. My father passed the truck on to me after getting back from Iraq in 2007. It has been used as a DD since then. However shortly before that my uncle had it did a lot of rigging with it to get it working, he and my father no longer speak which makes it hard for me to figure a lot of things out. I know that I believe it has a 350 from a 1989 Chevy Suburban. Everything else to MY knowledge is original. I am only 28 and have done as much reading as I can. Here is my current dilemma, the fuel gauge has never worked, always reads 1/4 full. So today I decided to try and fix it, I did my reading here following the steps as well as getting me a new OHM meter and checking my sending unit. The unit checked out fine. So I was curious about checking the gauge itself making sure its wires were connected correctly. ANd I came across what is pictured below.... I am no expert but to think that in 1964 they had all the wires together and run together at the back of the cluster seems off to me. So I'm here to ask, what year is this stuff from....and do you guys have any more advice on how I can fix my fuel gauge issue? ![]() ![]() ![]() ![]() ![]() THANKS!! |
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#2 |
Registered User
Join Date: Dec 2007
Location: N Texas
Posts: 580
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Re: Dash Suggestions and Questions
I don't see a pic attached.
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#3 |
Registered User
Join Date: Mar 2016
Location: Denton, TX
Posts: 14
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#4 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,248
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Re: Dash Suggestions and Questions
Welcome to the forum
![]() I would start by cleaning all the metal connections on both the plug and the connection on the dash. Have you checked to see if you are getting power to the dash on the fuel gauge wire? Also check and clean the connections where the fuel gauge attaches on the back of the dash under those plastic caps.
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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#5 |
Senior Enthusiast
Join Date: Feb 2007
Location: Spokane Valley, WA
Posts: 8,356
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Re: Dash Suggestions and Questions
After you clean up all those sockets, I would apply some dielectric grease to them before snapping it all back together. That will insure a solid connection.
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#6 |
Registered User
![]() Join Date: Jun 2011
Location: Phoenix,AZ
Posts: 946
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Re: Dash Suggestions and Questions
my fuel gauge is doing the same thing. shows 1/4 tank when it has power. just started doing this two weeks ago. 65 c10
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#7 | |
Registered User
Join Date: Mar 2016
Location: Denton, TX
Posts: 14
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Quote:
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#8 | |
Registered User
Join Date: Mar 2016
Location: Denton, TX
Posts: 14
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Re: Dash Suggestions and Questions
Quote:
Also any advice on how to check the wires? I just picked up a multi meter yesterday and am learning the ropes. |
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#9 |
Registered User
Join Date: Oct 2003
Location: Idaho
Posts: 257
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Re: Dash Suggestions and Questions
In addition to cleaning and checking for voltage it might be helpful to make sure all connectors within the main plug fit tight, and also all grounds are good. The circuit board grounds can sometimes quit making a good connection. If the sender is good and it is the correct ohm range for the gage it is possible the gauge is bad. What ohm range is your tank sending unit (how many ohms when full)? That fuel gauge is for a 30ohm sender.
That is the correct cluster for 64-66 gmc.
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beater 65 gmc at the moment |
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#10 | |
Registered User
Join Date: Mar 2016
Location: Denton, TX
Posts: 14
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Re: Dash Suggestions and Questions
Quote:
I was considering ordering a new dash connector from LMC and just cutting the old one out and splicing the new one. Wiring isn't my strong suit so I'm doing the best I can. Any advice on checking for voltage? I just picked up my first multi meter yesterday. Thanks! |
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#11 |
Registered User
Join Date: Apr 2008
Location: Md
Posts: 2,475
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Re: Dash Suggestions and Questions
Already been mentioned but, check and clean all ground wires, both the sending unit and the one to the dash.
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#12 |
60-66 Nut
![]() ![]() Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,248
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Re: Dash Suggestions and Questions
The 2 plastic caps to the left of the electrical plug should be covering the studs and nuts that attach the fuel gauge to the printed circuit. The printed circuit on the back of the instrument panel was a GMC only thing until '67.
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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#13 |
Chevy addict
Join Date: May 2012
Location: Iron Ridge, WI
Posts: 1,085
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Re: Dash Suggestions and Questions
Also check to make sure the float on the sending unit is empty, sometimes they take on gas and a new float is in order.
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#14 |
Registered User
Join Date: Nov 2009
Location: Sherman, ME
Posts: 2,359
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Re: Dash Suggestions and Questions
Lots of good info & suggestions so far!
But if the connections, sending unit, float, etc. all check out okay and the fuel gauge still doesn't read over 1/4 with the tank full, take a look at the resistor on the back of the gauge. The resistor should be a piece of fine strand wire wrapped around a rectangular insulator block that is secured to the back of the fuel gauge. You might have to take the cluster apart to see it. Anyway, if that resistor is damaged (fine wire broken) or simply isn't making good electrical contact with the fuel gauge terminals, it will prevent it from reading much over 1/4 tank even when everything else is okay. |
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#15 |
Registered User
Join Date: Mar 2016
Location: Denton, TX
Posts: 14
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Re: Dash Suggestions and Questions
Wow guys thanks so much for the information!
I will begin with working on it more this weekend when I have time. I went ahead and ordered a new sending unit, only because Brother's had them 50% off. |
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#16 |
Registered User
Join Date: Dec 2007
Location: N Texas
Posts: 580
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I can see now! Sorry about that Atchison, I was unable to see the pics on my pc the other day.
X2 all the info above. Also, make sure everything is grounded well...sending unit and the dash panel insert.
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#17 |
Registered User
Join Date: Mar 2016
Location: Denton, TX
Posts: 14
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Re: Dash Suggestions and Questions
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#18 |
Registered User
Join Date: May 2015
Location: Cedar Rapids, IA
Posts: 155
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Re: Dash Suggestions and Questions
The coil connections seem solid and, visually-speaking, the coils don't look as though any "magic smoke" was let out. If the wire connection between the soldered connection and the coil is not broken, I would spend some time and do a continuity check or ohm check with a multimeter to verify a solid connection between the gauge cluster plug and the fuel tank unit connection. I believe this is a tan wire on both ends.
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#19 | |
Registered User
Join Date: Mar 2016
Location: Denton, TX
Posts: 14
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Re: Dash Suggestions and Questions
Quote:
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#20 |
Registered User
Join Date: Apr 2010
Location: Willits Ca
Posts: 132
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Re: Dash Suggestions and Questions
I always use a pencil eraser on the circuit board circuits to clean them up. One old timer also suggested ketchup as well although I've never tried. Just like cleaning a penny!
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1965 Chevy C-20 slammed 292 L6 TH400 1967 Chevy C-20 on 91 suburban frame project(wife's) 1972 Chevy K-20 Mild 350/th350/np2o5 dd 1952 Ford Customline 2door kustom project 1967 Cadillac Superior Hearse (wife's) 1998 GMC Saffari (wife's dd) |
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#21 |
Registered User
Join Date: Mar 2016
Location: Denton, TX
Posts: 14
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Re: Dash Suggestions and Questions
Just run the eraser all over the circuit board? I'm willing to give anything a try
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#22 |
Registered User
Join Date: Feb 2012
Location: Scott city, ks
Posts: 301
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Re: Dash Suggestions and Questions
If you can't get it to work. i have an extra gauge cluster. I put all new after market gauges in my 64 gmc. All i'm keeping the cluster around for is the plastic. I'm not sure if its aloud but if you pay for shipping i'll send the gauges and and back side of plastic with the printed curcit board. Ill never use them. they worked when i took them out of my truck.
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#23 |
Registered User
Join Date: Feb 2012
Location: Scott city, ks
Posts: 301
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Re: Dash Suggestions and Questions
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#24 | |
Registered User
Join Date: Mar 2016
Location: Denton, TX
Posts: 14
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Re: Dash Suggestions and Questions
Quote:
Also it would be amazing if you'd let me buy the circut board and gauges from you. But just shipping isn't enough let me throw you some money for some beers or a bottle of whiskey? Just let me know |
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#25 |
Registered User
Join Date: Mar 2016
Location: Denton, TX
Posts: 14
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Re: Dash Suggestions and Questions
To update everyone:
Yesterday I was able to mess with it some more. I got a used gauge set. I installed my new sending unit, and hooked up the used set I just got, turn the ignition and get the needle bounce. Never started it because I've got the heater core out right now. Anyway I hooked up my cluster set click the ignition and got nothing. I tried this 3 more times to try and account for any error I may of made. Same results each time. So I decided to take my fuel gauge off my cluster and put it on the new used set. Then the ignition and my gauge does nothing, the temp gauge which I didn't mess with still did the initial jump. I'm assuming my gauges and circut board were bad? I for the life of me thanks to my PTSD meds can't recall if my gauges did this before I took them out. So I'm kind of stuck now.
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USMC Infantry 07-13 Operation Iraqi Freedom Current Finance and Economics Student. 1964 GMC Fleetside (4th Generation Owner) |
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