Wiring Question

[SCHRUMGMC]

Alright my Back right brake lights don't show up and neither do the back Red side-markers..As I was looking under my truck I noticed a Red wire looked like it had been cut off


Help please !!!

[JimKshortstep4x4]

No red wires were used on the rear lights. There is a four wire flat harness going from the front to the rear lights. Light green: backup lights, dark green: right rear turn signal, brown: park lights, tag light, and trim light, yellow: left rear turn signal.

Brake lights work through the turnsignal circuits.

Jim

[midniteblues]

check too make sure the rear light assembly has a good ground.

check inside where the bulb goes too make sure the contacs for the bulb are present and not broken off.

i like too use a long wire that has alligator clips. one side goes too the battery ground.

take the lens off the light and sand/scrap a clean bare spot of metal on the light houseing. touch/clip the wire too the spot and test your light.

if it works you'll need to take the two screws out that are next too the bulb

and clean up the spot around the two screws where the back of inner light houseing touches/mounts too the bed. this is where the ground is.

of course you should have a test light. with it you can check the bulb socket too see if it even getting juice.if its not then you need too keep testing the wire.

the rear harness has connectors too the lights in the rear bed sides pull them apart an test.(if you do this they prolly should be cleaned up an greased anyway.

still nothing?

in the last frame crossmember theres round plug with the four wires that go through the metal. pull the rubber peices apart an test from here also.(jim pointed out witch wires too test)

if all else fails

buy some new bulbs

[slow-1]

Originally Posted by midniteblues

check too make sure the rear light assembly has a good ground.

check inside where the bulb goes too make sure the contacs for the bulb are present and not broken off.

i like too use a long wire that has alligator clips. one side goes too the battery ground.

take the lens off the light and sand/scrap a clean bare spot of metal on the light houseing. touch/clip the wire too the spot and test your light.

if it works you'll need to take the two screws out that are next too the bulb

and clean up the spot around the two screws where the back of inner light houseing touches/mounts too the bed. this is where the ground is.

of course you should have a test light. with it you can check the bulb socket too see if it even getting juice.if its not then you need too keep testing the wire.

the rear harness has connectors too the lights in the rear bed sides pull them apart an test.(if you do this they prolly should be cleaned up an greased anyway.

still nothing?

in the last frame crossmember theres round plug with the four wires that go through the metal. pull the rubber peices apart an test from here also.(jim pointed out witch wires too test)

if all else fails

buy some new bulbs

Start with the last suggestion first...burned out bulbs and fuses have cost me countless hours of troubleshooting over the years...you would think I would learn.

[lolife99]

Any time you can post pics with your questions,... it would be very helpful.

[SCHRUMGMC]

Alright I will today, I dont have anyway of getting the fuses out ?

[slow-1]

They usually pry right out...use something non metallic...if they have been in there for 40 years they may be a little sticky, but the are just held in by thin metal tabs squeezing the fuse ends.

[SCHRUMGMC]

But what if they break in there ?

[slow-1]

Pull out the ends with needle nose pliers and put in a new one.

[SCHRUMGMC]

Oh ok well that was simple, how do I know if my points are bad ?? It wants to start but it won't' and it cut off while driving it on me
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[Tom Vogel]

Your points are probably fine. Check/replace your fuel filter.

[GASoline71]

Lots of old trucks have messed up rear lighting because of prior owners hacking up the rear harnesses to wire in trailer lights and such. I've had to rewire the entire rear ends of trucks because of it.

Gary

[SCHRUMGMC]

I just put a new fuel filter in there,,I wonder
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[Tom Vogel]

Originally Posted by SCHRUMGMC

I just put a new fuel filter in there,,I wonder
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It may already be plugged. Is there crap in the tank maybe?
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