What have you done to your FMTV or LMTV today

[Another Ahab]

The rainbow was amazing, a rare occurrence. A couple more shots of it

Wow. Unbelievable!

 

[wandering neurons]

Update on the LMTV cab swap: the cab is bolted down properly. Back-of-cab hooks are adjusted but I’ve got work to do on the cab latch. Good news and bad news, good first: after a week of troubleshooting I got Goliath to start and run, only the fuel gauge inop so far, probably connector. Bad news: spent a week troubleshooting “failure to start” problem. Between the -20-1 and several contributors here, found the problem. Somewhere between pin 87 of relay K1 and TL33 on the Aux Starter Relay there is an open connection. Absolutely everything else tests good including oil pressure switch, trans control module and VIM, relays, circuit breakers, wires, grounds, etc. I need to check the back of the PDP and make sure that socket is ok but otherwise, I’m much happier. Long road to “complete” but this is the biggest and toughest hurdle.
Will start another post about the broken wire…
Am doing the Snoopy “Happy Dance”. Am tired too…
Thx all!

 

[wandering neurons]

Actually, in deciphering the electrical schematics, both the fuel quantity wire from the sender to the gauge as well as the below wire from K1 to the Aux Starter Relay run through P43 under the main dash panel. I'm going to start there and do continuity checks both directions from there. Stupid me, it may be unplugged from troubleshooting this problem initially. Would be just my luck.
More to come...

Update on the LMTV cab swap: the cab is bolted down properly. Back-of-cab hooks are adjusted but I’ve got work to do on the cab latch. Good news and bad news, good first: after a week of troubleshooting I got Goliath to start and run, only the fuel gauge inop so far, probably connector. Bad news: spent a week troubleshooting “failure to start” problem. Between the -20-1 and several contributors here, found the problem. Somewhere between pin 87 of relay K1 and TL33 on the Aux Starter Relay there is an open connection. Absolutely everything else tests good including oil pressure switch, trans control module and VIM, relays, circuit breakers, wires, grounds, etc. I need to check the back of the PDP and make sure that socket is ok but otherwise, I’m much happier. Long road to “complete” but this is the biggest and toughest hurdle.
Will start another post about the broken wire…
Am doing the Snoopy “Happy Dance”. Am tired too…
Thx all!

 

[Another Ahab]

Actually, in deciphering the electrical schematics, both the fuel quantity wire from the sender to the gauge as well as the below wire from K1 to the Aux Starter Relay run through P43 under the main dash panel. I'm going to start there and do continuity checks both directions from there. Stupid me, it may be unplugged from troubleshooting this problem initially. Would be just my luck.
More to come...

A lesson from the Stoics of Ancient Rome:

- Laugh WITH the Gods, while they are laughing at you

Because there's plain nothing like a good laugh!

 

[wandering neurons]

And a quote back to you along those lines:
Euripides: 'Those whom God wishes to destroy, he first makes mad.'

Which leads up to the fix for my starting/fuel quantity problem: P43 under the dash is the same shape as another Pxx (can't remember which) but more pins used. The other connector only uses 4 or 5 pins. Once I connected the right P to the right J, everything worked correctly! Starts correctly, fuel quantity reads correct, etc.

Similar problem with the fan solenoid under the PDP. The original cab on the truck was not original. Apparently, the original cab on my truck had been replaced with another LVAD cab according to a plate riveted to the dash. It must have come from a three-axle M1093 or 1094 as there is a dual air solenoid next to the CTIS manifold, whereas the normal M1078 and M1081 have a single air solenoid. The single solenoid is for the fan clutch. The dual air solenoid is for fan clutch and inter-axle air pressure.
That being said, I think that I had the fan clutch solenoid plugged into the inter-axle plug. Air didn't dump out of the solenoid as normal when the master power switch is turned off (the hiss under the dash when the air to the fan clutch is dumped at power-off).

So..... Getting closer. Finding leaks, and now can start buttoning up panels and rebuild the interior!

A lesson from the Stoics of Ancient Rome:

- Laugh WITH the Gods, while they are laughing at you

Because there's plain nothing like a good laugh!

 

[Ronmar]

Well done!

 

[wandering neurons]

PM'd you with a question...

Well done!