First time Humvee owner, lifetime admirer w/ a Q...

[Westo]

I have heard there is a relay that can stick open, powering TCM all the time. I am working my way to that issue...

That's probably what it is. I read the older posts again and it looks like the light isn't on when it's running, which means it isn't what I had. The only thing that made me think of my issue was the dim light, but that could just be a dirty lens or something.

 

[OrangeElvis]

Best upgrade I made for the humvee, I've been having this fan on for the pass month now

Thank you for the feedback!

 

[OrangeElvis]

That's probably what it is. I read the older posts again and it looks like the light isn't on when it's running, which means it isn't what I had. The only thing that made me think of my issue was the dim light, but that could just be a dirty lens or something.

Well, now that I said that - yesterday the light was flickering while driving at first, then just stayed on, solidly lit. ***sigh***


I will take it out again this evening and see what I get, lol.

 

[Westo]

Well, now that I said that - yesterday the light was flickering while driving at first, then just stayed on, solidly lit. ***sigh***


I will take it out again this evening and see what I get, lol.

See if you can get it into the diagnostic mode. If it does you might find out what's causing the light, and if it doesn't then you almost certainly have a TCM problem. Here's a helpful guide to troubleshooting the TCM if you don't have it already.

 

[OrangeElvis]

See if you can get it into the diagnostic mode. If it does you might find out what's causing the light, and if it doesn't then you almost certainly have a TCM problem. Here's a helpful guide to troubleshooting the TCM if you don't have it already.

Thank you. I have checked it twice - once, after I accidentally connected the power lines to 24V and got code 53 among others - which put me into LIMP mode. After correcting the wiring mistake, I checked again and got NO codes (just 12 over and over).