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1976 Chevrolet Blinker Problem


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TravisH
User

Jun 22, 2016, 1:01 PM

Post #1 of 16 (1336 views)
  post locked   1976 Chevrolet Blinker Problem  

I wanted to ask and see what someone could thinks about this. Yesterday the back tail lights were not working the front ones were very dim looked and noticed a blown fuse replaced it now the front blinkers are nice and bright as should be brake lights now work but the tail lights both blink right and left at same time like emergency were on the front works as suppose to just rear. Not sure if it's the switch or a relay.
Thankyou;
Travis


Tom Greenleaf
Ultimate Carjunky / Moderator
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Jun 22, 2016, 1:06 PM

Post #2 of 16 (1334 views)
  post locked   Re: 1976 Chevrolet Blinker Problem  

Travis - give us more of a chance than it's a 76 Chevy! There are a lot of models.


Some clue - truck, has trailer wiring too - anything more?


T



kev2
Veteran
kev2 profile image

Jun 22, 2016, 1:10 PM

Post #3 of 16 (1330 views)
  post locked   Re: 1976 Chevrolet Blinker Problem  

SWAG check rear double element bulbs (1157) a bad element will cause feedback and blinking on other circuit...


TravisH
User

Jun 23, 2016, 4:45 PM

Post #4 of 16 (1307 views)
  post locked   Re: 1976 Chevrolet Blinker Problem  

Apologies it is a 1976 chevrolet p/u and it does have trailer lights hook up wiring. It does not have a hitch recover just a trailer ball on bumper.
Thankyou
Travis


TravisH
User

Jun 23, 2016, 4:48 PM

Post #5 of 16 (1306 views)
  post locked   Re: 1976 Chevrolet Blinker Problem  

Would you explain what is double element bulbs not familiar with those.
Thankyou
Travis


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jun 24, 2016, 3:53 AM

Post #6 of 16 (1290 views)
  post locked   Re: 1976 Chevrolet Blinker Problem  

Bulbs can have two filiments, one for brighter light the other for dimmer light in same bulb.


Both trailers and about all US vehicles for 1976 would use 1157 which has two filament. The other with one is 1156 like for back up lights.


The sockets mess up as the two filament bulbs light with two contacts, the single ones with one. Both use a ground usually the side of the sockets all sockets in question at this age. and 30 - 40 years younger too.


If you put a single filament bulb in a two filament socket you then connect both. If so in that case when either has power it puts power to the other and it all goes funky on you.


Trailer wiring frequently taps into brake light power and turn signals - same bulb different color wire, running light power and a ground wire for standard 4 wire trailer lighting. All places for things to mess up,


T



TravisH
User

Jun 24, 2016, 12:16 PM

Post #7 of 16 (1275 views)
  post locked   Re: 1976 Chevrolet Blinker Problem  

Thankyou, for the help with the bulbs after going over they checked out right. On the trailer wiring started looking at it and noticed at where you plug the trailer harness into one wire is hanging loose where the one male prong on the plug. Now I'm not sure if it should be that way or makes any difference. While under the rear of the truck the electrical tape covering the wires at connections wasn't on good looked like there was some corrosion. Start looking at that later. Any more advice will be appreciated.
Thankyou
TravisH


Tom Greenleaf
Ultimate Carjunky / Moderator
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Jun 24, 2016, 1:15 PM

Post #8 of 16 (1272 views)
  post locked   Re: 1976 Chevrolet Blinker Problem  

It's not supposed to hang the trailer wiring plug - that was added probably to correct wires. Standard 4 prong should be 3 females, one is left blinker and brake light both (yellow) , one is for the right (green) one is for running lights (brown) the exposed one should be white for GROUND and the opposite for matching trailer - a standard.


How that's hacked in most of the time is the problem to check for. While there do the wires up right. Hang harness so it can't harm itself just because you are there.


It can be the problem but IMO more likely a socket on truck. Heck it's a 1976 - could be anything about now,


T



TravisH
User

Jul 3, 2016, 8:39 PM

Post #9 of 16 (1223 views)
  post locked   Re: 1976 Chevrolet Blinker Problem  

I wanted to Thankyou for your input on my blinkers problem on my 1976 chevy p/u found the problem turned out wires were brunt when at some point some exhaust work was done I mean burnt bare and touching one another causining the short making both tail lights blink simultaneously.
Another question what would cause the running lights not work they work for brief time till the accessory fuse burns out it also causes the blinkers to be real dim till the fuse blows. The dash lights don't work ether I know there is a short somewhere but need some input on a few places to look or other causes. Appreciate the help have a good 4th.

Travis;


Tom Greenleaf
Ultimate Carjunky / Moderator
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Jul 4, 2016, 4:04 AM

Post #10 of 16 (1216 views)
  post locked   Re: 1976 Chevrolet Blinker Problem  

Glad you found it. As for dash lights just how much wiring was burned for lighting at all? Pretty sure plain running lights crossed with power anywhere they would come on or vs versa blow a fuse trying to empower the wrong lights or dead to ground.


Seems like plain wire being held in place in loom out of harm's way should be inspected and corrected. Still don't trust trailer wiring as that was probably added not a feature that came with a '76 truck or wired separately OE - same wires and how tapped into always a weak spot,


T



(This post was edited by Tom Greenleaf on Jul 4, 2016, 4:10 AM)


TravisH
User

Jul 4, 2016, 7:04 AM

Post #11 of 16 (1208 views)
  post locked   Re: 1976 Chevrolet Blinker Problem  

Quite a bit of the wiring was burnt thought bad in one spot for about 2" could still be more on down just haven't found it yet. Your right about powering up where it shouldn't just have to keep looking.

Thankyou;
Travis


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jul 4, 2016, 7:54 AM

Post #12 of 16 (1205 views)
  post locked   Re: 1976 Chevrolet Blinker Problem  

Yes - if just a "running light" wire is trying to power up more power used by another it would and should blow a fuse.


Wiring mess. IDK - if you can take all the covering off it can be replaced with protective like a mine vacuum cleaner hose stuff with a split to put wires in for lack of the right word.


Get some shrink wrap for wire if you find a bare spot cut it there, splice with solder and cover it up with shrink wrap then tape if you wish then back in place out of harm's way.


Good automotive wire is a pest to find in just small amounts. Home centers maybe? While at one they are now carrying another fav product parts outlets usually don't which is "liquid Electrical Tape" a brush in cap stuff that really seals out moisture well. Use fast or whole little bottle will begin to harden if cap off too long.


Good old truck IMO and family owned many versions. Worth some effort if not a real mess,


T



TravisH
User

Jul 4, 2016, 11:51 AM

Post #13 of 16 (1195 views)
  post locked   Re: 1976 Chevrolet Blinker Problem  

That's what seems to be going on powering up taking power from the blinkers till there dim until the fuse blows then returning to normal. Where do you get liquid electrical tape I've heard of it but never used it. Looking for shorts can be tricky.
Thankyou;
Travis


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jul 4, 2016, 12:20 PM

Post #14 of 16 (1193 views)
  post locked   Re: 1976 Chevrolet Blinker Problem  

These products aren't short cuts the make repairs last. Have a "Liquid Tape" in front of me from Home Depot. Now in different colors even.
4 oz plastic bottle is about $5 bucks - just handy stuff anyway. It resists oils and dang near fuel tolerant too so doesn't wash away, stays flexible and is electrical insulation - no shorts thru it to something else.


I wouldn't use that as the only product just on top of finished splices once known working. If you choose to strip and crimp stuff, wire nuts and not real solder splices this should maximize life of even that way.
Exposed wires really shouldn't be left to any chance of moisture or rubbing again once spliced or a section of wire added seal the connections is all I'm saying on that,


T



TravisH
User

Jul 9, 2016, 6:12 PM

Post #15 of 16 (1165 views)
  post locked   Re: 1976 Chevrolet Blinker Problem  

Dear Mr Greenleaf:

Thankyou for all your help with my electrical problem on my 1976 chevrolet truck got lined out blinkers. running lights, dash lights. Blinkers were shorting and blinking at the same due to welding on the tailpipe burning up the wires I beleave I already mentioned this, after going over the running light and dash lights circuit it turned out to be the two 4 amp fuses. Even though they checked good when I installed new fuses started working right installed a couple new dash bulbs as well now works. Took your advice and used liquid electrical tape and used wire nuts instead of but connectors never liked them kind of contrary. You also gave advice to me on a carburator trouble on this truck as well idling too fast it turned out to be a disconnected vacuum line that I couldn't see right off. Any way appreciate all the help and advice know were to come for question have a good evening.

Sincerely;
Travis


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jul 9, 2016, 7:59 PM

Post #16 of 16 (1160 views)
  post locked   Re: 1976 Chevrolet Blinker Problem  

Sounds good Travis, happy to hear things are working out.
The liquid tape stuff is a staple of mine for assorted things great to seal water out of a wiring connection is just one great purpose.


Just on fuses: Use a plain test light on fuses when the circuit should be on test for power at both sides not just looks of a fuse as they don't all just classic burn out and see it.


I'll close out thread as solved. You may ask any moderator to reopen upon request or start another thread for another issue,


Tom







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