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Turned 13K the other day, still loving it every time I drive it, installing A/C and a low profile helmet top at this time, then she gets a new paint job! I have my eye on a few Dmax salvage trucks coming up for auction, after I turn the DuraVee into a soccer mom truck with doors, top and A/C I...

United Parts Service out of CA, Have not bought anything lately but did tons of business with them 25 years ago.

Top priority for anyone with a 4L80E should be a working trans light, it is absolutely essential in troubleshooting and helping to insure you do not fry the transmission.

Welcome to the SS forums!

What code/codes does the TCM report? If you are not already you need to start reading the codes and using the troubleshooting supplement. I would venture to say you are getting a 37 or a 38, brake switch stuck on or off, you are likely not driving it far enough to get a code with the switch...

Also again do all voltage tests with the equipment connected, use a sharp meter (or test light) probe to pierce the wire jacket, When I locate 290, 537 and 657 at the TCM I wrap a bread tie around them to make it easier to find the next time I am looking for voltages (or ground in the case of...

You cannot connect the relay incorrectly, it does not matter which way 57/29 are connected or the 290/291 wires. one side has female and the other male connectors, same thing with the circuit breaker. You need to start confirming if you are getting 12V to 537 and 290/291 at the TCM then if not...

You should have 24V across wires 29 and 57 at the transmission relay in the run position. 57 goes to ground and 29 goes to the run circuit. This is the only place in the transmission circuits you should have 24V This is shown in the picture above. Did you check for 12V at 537?

Then what lights are you talking about?

If you do not have power going into the TCM box at 290/291 then check 537, if you have power there then you have a relay problem, ether the relay wiring or 24V feed to the coil. If you do not have power to 537 then you have a general 12V feed/breaker issue. This should be checked at J1 going...

Are only the lights effected? gauges all still work fine?

Sounds like you have a short in the lighting wiring and you are tripping the breaker, can you drive it in the daytime with the lights turned off? Check the wires around the steering shaft for chaffing. If you feel brave turn the lights on and reach up under the dash and move the wire harnesses...

So you had a code 83 and replacing the TCC solenoid did not fix your lockup issue AND you do not have a lockup issue with the TCM disconnected then the only place left to look is the harness/connectors and the TCM itself.

Have you checked all the wire harnesses involved for chaffing? Have you replaced the TCM? What were the codes after it crashed thee weeks ago?

You can get a refurb for about the same price

There are two 12v feeds to the TCM one switched and one not switched, you need to make sure you have both of them. Here is the troubleshooting guide that will give you the schematics you need to troubleshoot. You will need 24V to the relay coil with the ign. on

The only thing I can add is it is common wisdom that no electric fans are available that can draw/push more air than the factory fan and adding fans only make the problem worse as it actually restricts flow. Having said that I have never tried this myself. I am going the full dual fender cond...

Welcome to the SS forums! No the headlights will not work with the dimmer switch removed, that switch sends power to ether the low or high beam light elements.

Heck the rear wall may be worth as much or more than the top

To be honest though it checks almost all the boxes, someone "worked" this truck over. The truck is equipped very nicely,,, seats, doors, spare tire, bumper/brush guard etc. etc....everything looks to be working, was rebuilt in 2015, the A/C was not checked, and something really strange is going...