I killed my electrical..... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Tom · 01-16-2003, 10:34 PM

While my truck was down and out, I figured hey, nows a good time to re-wires stuff. BAD IDEA!

I cut the wire that provides light power for the instruments. I then attached wires for the lights in my oil pressure, tranny temp, and tach, then reconnected everything together. Well, the lights work great. But the tach is only reading between 0-100rpm and it isent engine speed spacific. It just always vibrates like that now. Also my voltmeter, water temp and fuel gauge arent working now. Sterio still works great, and like I said before the lights are nice and bright. So, what exactly did I do? Its a green wire I spliced into if that helps....

low 84 · 01-16-2003, 10:36 PM

sounds like your tach has a bad ground. don't know about the others?

LOHRTBT · 01-16-2003, 10:56 PM

doh!

79BIG10 · 01-17-2003, 12:42 AM

Try this from Mike's site Tom. #1 Lt. green = high beam indicator lamp. #2 Gray = instrument lamps. #3 Black = ground. #4 Pink/black stripe = ignition. #5 Tan = oil pressure sending unit. #6 Pink/black stripe = ignition. #7 Pink = Fuel (will be spliced to #18 if you have dual tanks. Use the wire from #18 to hook up fuel gauge). #8 Black = ground. #9 Dk. green = water temp sending unit. #10 Black = ground. #11 Lt. blue = left turn signal indicator lamp. #12 Dk. blue = right turn signal indicator lamp. #14 Yellow = fasten seat belt light. #15 Md. blue = choke warning light. #16 Pink/black stripe = ignition. #17 Tan/white stripe (2) = park brake warning light. #18 Pink (2) = Fuel gauge sending unit (splice to other pink wire at #7).

Tom · 01-17-2003, 12:54 AM

Hehe thanks guys

I figured the tach out. It needs a filter to work with the MSD module. Also the tranny temp ground had come un done. So those are good. Now why the water temp, volt meter and gas gauge arebnt working, I dont know.

79Silv4x4 · 01-17-2003, 01:23 AM

Sounds like my gagues--I hate electrical gremlins.

85Silverado · 01-17-2003, 10:27 AM

Electrical gremlins are my pet peeve about working on my truck.....no matter what...i manage to get shocked at least once...lol

Low87 · 01-17-2003, 11:19 AM

Quote:

Originally posted by 85Silverado
Electrical gremlins are my pet peeve about working on my truck.....no matter what...i manage to get shocked at least once...lol

Umm.......Some people unhook their battery while working on electrical systems. Just a thought.

PHOENIX · 01-17-2003, 12:42 PM

Damn Tom is that the green wire you cut when I was over there? You need to get behind that bezel and start tracking down those wires. Check to see if you have what you need at the gauge.

and remember when you cut a wire and your going to check it for power, check both ends of the wire, you may be testing the wrong side

Tom · 01-17-2003, 12:53 PM

Quote:

Originally posted by PHOENIX
and remember when you cut a wire and your going to check it for power, check both ends of the wire, you may be testing the wrong side

Thanks eddie, really thanks

yeah its that green wire. Im thinking about pulling all the extra wires off and reconnecting it by its self to seeif that fixes it. If so, then Ill need to use a different power source for the lights.

01-16-2003, 10:34 PM	#1
Tom driving is in my blood Join Date: Dec 1999 Location: Mesa AZ Posts: 5,748	I killed my electrical..... While my truck was down and out, I figured hey, nows a good time to re-wires stuff. BAD IDEA! I cut the wire that provides light power for the instruments. I then attached wires for the lights in my oil pressure, tranny temp, and tach, then reconnected everything together. Well, the lights work great. But the tach is only reading between 0-100rpm and it isent engine speed spacific. It just always vibrates like that now. Also my voltmeter, water temp and fuel gauge arent working now. Sterio still works great, and like I said before the lights are nice and bright. So, what exactly did I do? Its a green wire I spliced into if that helps.... __________________ -78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me.

01-16-2003, 10:36 PM	#2
low 84 Registered User Join Date: Jan 2002 Location: Houston, TX Posts: 2,144	sounds like your tach has a bad ground. don't know about the others? __________________ '51 F100, backhalf with a narrowed 9 and coil overs, 18.5" mickeys, monte front clip, +400" sbc in the works '05 1500 Crew Cab RIP '84 swb 5/7 drop, solid cammed 408 w/ fully ported dart heads, th350 w/ 10 inch hughes, 12 bolt w/ 3.73 richmonds and a locker '80 swb 4x4 in progress: 7" lift, 350 th350/np205, d44 and 1.5" ORD tie rod, 14BFF w/discs , armored diff covers, 40" MTR's

01-16-2003, 10:56 PM	#3
LOHRTBT BeWarE tHe eViL CrAnkTOe! Join Date: Oct 2002 Location: Yukon, OK Posts: 3,605	doh! __________________ ~Dave~ You can call me Mike, Mike Oxlong - 1986 Chevy SWB - Stock for now - *1986 Chevy Custom SWB* *Stolen 6/26/05* - 1985 Chevy SWB SOLD - 1999 T/A Some mods www.cardomain.com/id/ramairdave AIM Screenname - Jester84

01-17-2003, 12:42 AM	#4
79BIG10 I'm back with 2nd truck! Join Date: Feb 2002 Location: Texas Posts: 3,774	Try this from Mike's site Tom. #1 Lt. green = high beam indicator lamp. #2 Gray = instrument lamps. #3 Black = ground. #4 Pink/black stripe = ignition. #5 Tan = oil pressure sending unit. #6 Pink/black stripe = ignition. #7 Pink = Fuel (will be spliced to #18 if you have dual tanks. Use the wire from #18 to hook up fuel gauge). #8 Black = ground. #9 Dk. green = water temp sending unit. #10 Black = ground. #11 Lt. blue = left turn signal indicator lamp. #12 Dk. blue = right turn signal indicator lamp. #14 Yellow = fasten seat belt light. #15 Md. blue = choke warning light. #16 Pink/black stripe = ignition. #17 Tan/white stripe (2) = park brake warning light. #18 Pink (2) = Fuel gauge sending unit (splice to other pink wire at #7). __________________ 1979 Chevrolet Bonanza Big10 "Tootsie Roll" 1985 Chevrolet Silverado (wife's) Member of the Southern Bowties Club "Don't underestimate how sexy a fat man who drinks to excess can be." Homer Simpson

01-17-2003, 12:54 AM	#5
Tom driving is in my blood Join Date: Dec 1999 Location: Mesa AZ Posts: 5,748	Hehe thanks guys I figured the tach out. It needs a filter to work with the MSD module. Also the tranny temp ground had come un done. So those are good. Now why the water temp, volt meter and gas gauge arebnt working, I dont know. __________________ -78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me.

01-17-2003, 01:23 AM	#6
79Silv4x4 Workaholic Join Date: Oct 2002 Location: Katy, TX Posts: 1,589	Sounds like my gagues--I hate electrical gremlins. __________________ 1979 K-10 Silverado (work in progress) 1991 V1500 Subruban 1999 Suburban LT 4x4 2006 Suburban LTZ (daily driver)

01-17-2003, 10:27 AM	#7
85Silverado Registered User Join Date: Dec 2002 Location: Milwaukee, Wisconsin Posts: 198	Electrical gremlins are my pet peeve about working on my truck.....no matter what...i manage to get shocked at least once...lol __________________ Paul D. '78 C20 Scottsdale 350ci 3 speed with granny gear 14 bolt rearend My trucks are "Car-Guy safe".......which pretty much means death trap in the hands of a normal civilian.

01-17-2003, 12:42 PM	#9
PHOENIX Registered User Join Date: Oct 2002 Location: Phoenix, Arizona Posts: 4,703	Damn Tom is that the green wire you cut when I was over there? You need to get behind that bezel and start tracking down those wires. Check to see if you have what you need at the gauge. and remember when you cut a wire and your going to check it for power, check both ends of the wire, you may be testing the wrong side __________________ * AVOID: LOPER'S PERMORANCE / LOPERSPEED.COM OF PHOENIX, AZ & COTTMAN TRANSMISSION *



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