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The relay should not get noticeably hot. The underside of the power panel cover may have a diagram of relays and breakers. The trans goes from neutral into 2nd. 1st is low range.

If the polarity box is bad you need to replace it. Its involved with charging regulation on that truck. Bypassing it is only a temporary fix. If you want to leave it bypassed and just make the system charge you can run a temporary 24v to the alt regulator 24v terminal and disconnect the ac lead.

The codes can be cleared from the keypad once the issue is fixed.

I think it all comes down to a low voltage/power issue. Replace the bad lbcd and you need to check all connections again. Batts, panel alternator.

The trans can still come up in neutral and have a stored code from a previous incident. If the truck was stuck in a gear Ans speed went up or down out of that gears range, and it didn’t shift then a code as to why should have been stored. The wtec5 module is under the passenger dash. The...

They have wtec5 probably. Unhappy trans can inhibit crank. Bad lbcd can cause improper batter charging. Trans issue will usually have a code on the keypad. If you have power to all electronics with dash switch you can jump the starter. But it may start in gear so be careful.

Unplug the connector from it and leave it unplugged.

Is the polarity box still bypassed? Both voltages? You can try unplugging the military connector from it. See if you can pull up any codes from the trans keypad. If you have power to the engine electronics you can try to crank from the engine bay switches.

Check the big relays under the power panel.

Maybe its something stupid like your dash power switch went bad. Seen that before. Alot of the switches are the same the legend just pops out. You can try swapping switches.

Its an electronic engine and will not start if no power to engine computer. Pull up the power panel there are 2 relays under there make sure all connections are tight. In the engine bay sometimes there is a filter that the engine computer power goes thru. Have seen that fail and trip a breaker...

The lbcd is basically a diode array that prevents cab electronics damage if someone connected the batteries reverse by accident. It also aids in battery charge regulation. They do go bad and will cause an improper charging situation. Let me know if the master relay is energizing with the power...

If the alternator wasnt charging the batts properly. Which can happen with a bad lbcd. They could just need a good charge.

Check the ground at the starter and all the batt connections. It sounds like the master relay isnt powering on. Its in a box to the right of the battery box. There is also a manual cutoff switch that can be accessed under the box.

Try disconnecting the military twist plug from the lbcd and see if it will power up. The number one reason an A1 truck wont start is batteries and/or battery connections. There is a big shared ground at the starter also. Even if you are reading 24 volts does not mean the batts are good. Did the...