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Update: I want to thank everyone for your comments up this point. Yesterday I was removing some of the terminals from the LBCD, starting with the top one. I put it all back together and, as you know, nothings would start. Today, I was able to pull the LBCD, which was a total pain to explore...

Thanks for that. I think it would be good to get some batteries I have a bit more confidence in. I just don't know if that is the cause of my issues. Planned upgrade for sure...among many others as the budget allows.

So do you think that it is coincidental? That the batteries just got so bad that it won't start at all? Each battery is between 11.X volts and 12.X volts. When I measure the voltage for the 12V battery at the LBCD it seems spot on. The 24V seems super weird. As a sanity check, I measured...

Agreed. I think they are not optimal, but until today I could reliably start the truck anytime. I was using these sub-optimal batteries in 0 degree weather, no ether and it would start. I suspect I did something to make it so I am not getting 24V to the dash, no lights, no buzzers.

I agree. That makes sense...and I am not convinced my batteries are in great shape. The only thought I had was that for the past 3 weeks, I would start the truck daily, take joy rides around with my kids, etc. There was the 'battery disconnect' issue, but that has been that way for some time...

Thanks for the suggestions. I think I caused more problems now. I checked the battery connections. Voltages seem ok. Range between 11.X - 12.X. I looked into the battery disconnect box. Clean. Measured voltages there. I went to the LBCD. Looked ok, but there was some surface rust on the...

Hi All, 2003 M1078A1. The battery disconnect light comes on frequently - even for a short joy ride. Once on, I see the voltage all over the place, then the Transmission light comes on. I also see that it goes into a limp-mode, only allowing 4th or 5th gear max. The batteries are the...

Great suggestion. I found the loose clamp and tightened it down. All is well in the world. Much quieter.

Any suggestions on a fix? Any help is appreciated! Thanks guys.

My oldest son say he thinks it is coming from OK. I put it in neutral and rev it but can't reproduce the sound. Only when driving. Does that still make sense?

Hi All, 2003 M1078A1 There is a squeaky balloon noise under passenger dash when accelerating. It has recently gotten worse. I suspect an air line, but torqued them all to make sure they are reasonably tight. I had my kid take a video when I was driving down the road a bit. It is not...

Just a relay. Jumpered K7 then K8 started working. Need a couple headlights too.

This was great help! Thanks. Got everything situated.

Thanks in advance for any help. You guys have been really helpful. I have a 2003 M1078A1. I have the more updated light module - not the 3 level variety. I can't see to get the headlights to work. Other lights do come on. I checked the various breakers and that doesn't seem to an obvious...

FYI, thanks for all the help. TCM replacement worked to get it moving. Thanks.

OK, I have the old TCM out. How can I purchase this from you?

That is what I think happened here... Cost?

OK, great info. I'll post with updates.

Hi All, I just purchased a 2003 M1078A1 from Govplanet. Upon delivery it was said that the Transmission Control Module may have an issue. I charged up all 4 batteries successfully. With the normal start up procedure, it would not start. Dash lights came on normally. I removed the starter...