M1078 running lights flashing

[Konichiwa512]

Does anyone happen to know which relay on the dashboard panel controls the LMTV running lights? Those are the yellow lights above the windshield and on each door, etc. Mine are flashing intermittently, regardless of whether the truck is moving or stationary, so I suspect a dying relay. I cannot find any reference in the manuals specifying which relay controls those lights.

 

[mkcoen]

Page 7-36 of the -3 manual. Looks like K20 is the one you want.

https://www.steelsoldiers.com/attachment.php?attachmentid=326753&d=1335459541

 

[Konichiwa512]

Fantastic. Anyone know the best place to buy an LMTV 12 volt relay?

 

[mkcoen]

Fantastic. Anyone know the best place to buy an LMTV 12 volt relay?

Suprman is the local FMTV parts man.

 

[coachgeo]

Fantastic. Anyone know the best place to buy an LMTV 12 volt relay?

for this........ Napa or any other "real" auto parts store. Nothing fancy about it... just a 12v commercial truck style relay. Just take it with you and they should be able to match it up.

 

[Konichiwa512]

I replaced the relay for the running or 'marker lights,' as the book calls them, with a new one from the truck parts store. The problem remains and now the headlights have started flickering also, which is a much bigger problem. Does anyone happen to know where the M1078 marker lights and headlights are grounded? My other idea is to polish up the ground connection and see if that does the trick. After that, I will be out of ideas.

 

[aleigh]

I replaced the relay for the running or 'marker lights,' as the book calls them, with a new one from the truck parts store. The problem remains and now the headlights have started flickering also, which is a much bigger problem. Does anyone happen to know where the M1078 marker lights and headlights are grounded? My other idea is to polish up the ground connection and see if that does the trick. After that, I will be out of ideas.

I had similar problems and it was actually the old circuit breakers the truck came with. Try a fuse, you can use regular ATC style automotive bladed ones. Also welcome from Phoenix. If that doesn't solve your problem, all the schematics for the truck are in the TMs. Your next stop though is probably going to be to pull the fuse panel and see what you are dealing with corrosion wise underneath.

 

[Suprman]

There are a bunch of grounds on the back of the bumper. Use a meter check your voltages at the power panel. You could have a wavering voltage issue causing the flickering.

 

[Konichiwa512]

Thanks everyone for the help. I cleaned up the ground connections and replaced the government circuit breakers with automotive fuses. I also brushed some Deoxit on it all for good measure. I am not sure if the trouble is gone for good, but I just finished a flicker-free test drive.