Humvee M1114 rear right signal light issues

[murilod]

Hi,

Im working on a M1114 and Im having problems with my rear right side turn light It does not turn on

Things that I checked:
Light bulb ( tested on the left side)
Voltage : Im getting 24 on and off (with the turn switch on)
Front turn light works
Break light works.

I also checked the ground wire, and it seems to be ok

Any ideas ?? or check steps ?

Best Regards,

Murilo

 

[juanprado]

make sure both bolts are clean and good connection as each mounting bolt is a different ground to the light fixture.

 

[murilod]

make sure both bolts are clean and good connection as each mounting bolt is a different ground to the light fixture.

Tanks for the reply !!
I used a sand paper to clean both screws and the metal plate that link them, I also tried on another tail light assembly with the same results. But when I measure with my multimeter it shows the 24v on and off .
The funny part is that the break come up with no problem (until I turn the turn signal on) and the break light is the same one (signal light) That to me makes no sense

Best Regards

 

[Mullaney]

Tanks for the reply !!
I used a sand paper to clean both screws and the metal plate that link them, I also tried on another tail light assembly with the same results. But when I measure with my multimeter it shows the 24v on and off .
The funny part is that the break come up with no problem (until I turn the turn signal on) and the break light is the same one (signal light) That to me makes no sense

Best Regards

.
It can be really "screwy" when you are hunting down a ground problem... Sure seems to me that is still what you have happening. My fail-safe for hunting down grounding problems is to get a length of 14 gauge wire that will reach from the front of the truck to the back. Get yourself a couple of BIG alligator clamps or something similar. Put one on each end of the wire. If you can solder, do that so you aren't fighting a self made connection problem.

Then attach one end of your 14 gauge test wire to a negative post on the battery. Walk to the troublesome light - and connect the other clamp to the light that isn't cooperating. If that works, you just need to follow the sheetmetal to the frame. Something somewhere might be corroded that is out of sight.

AND, since it is a tail light you might use a jumper cable if you have one that long. One red (or black) to the battery post and one to the bolt on the light.

 

[murilod]

.
It can be really "screwy" when you are hunting down a ground problem... Sure seems to me that is still what you have happening. My fail-safe for hunting down grounding problems is to get a length of 14 gauge wire that will reach from the front of the truck to the back. Get yourself a couple of BIG alligator clamps or something similar. Put one on each end of the wire. If you can solder, do that so you aren't fighting a self made connection problem.

Then attach one end of your 14 gauge test wire to a negative post on the battery. Walk to the troublesome light - and connect the other clamp to the light that isn't cooperating. If that works, you just need to follow the sheetmetal to the frame. Something somewhere might be corroded that is out of sight.

AND, since it is a tail light you might use a jumper cable if you have one that long. One red (or black) to the battery post and one to the bolt on the light.

Thanks !!!

That is a great idea !! Im going to try that.

Thanks for the help !!

Best Regards,

Murilo

 

[papakb]

In earlier military vehicles they used to add a short flat brass link between the 2 bolts that are used to mount the taillights to make sure both bolts saw good grounds. The HMMWV has ground wiring installed in the harness but that doesn't guarantee that a wire didn't let go somewhere along the life of the vehicle. Put a short brass strap between the bolts and make sure to put some anti-oxidant paste on it to stop corrosion in the future.