Lmtv won't start

[Hauling the mail]

I have replaced the the power switch and the push button as well as the the starter relay. I even jumped the relay on the dash with a wire from the top and bottom poles of the starter relay. All I get is a clicking sound from the relay on the dash. Any ideas where else I should check next. Thanks in advance . Rob.

 

[snowtrac nome]

first question does the transmission control module power up. if so than open the cab jump the large positive wire to the small switch wire on the starter motor, if your starter rotates your problem lies between your new relay and the starter. these trucks have another relay down by the starter I think as I remember its on the frame wires and grounds have been known to come loose on them.

 

[NDT]

Batteries hot and connected properly? Starter is 24 volts. Many other possibilites, check the easy issues first like batteries.

 

[snowtrac nome]

good point I always forget to suggest this because its the first thing I check 90 percent of no starts are weak batteries

 

[Hauling the mail]

Thanks I'll try jumping the starter once I have the cab up. I just put 4 new 6 tm batteries in and even tried jumping with the slave but the same results

 

[Hauling the mail]

I forgot to mention that the transmission module does light up when the power is on

 

[snowtrac nome]

good there is a relay box under the dash down by the passengers seat its missing the tcm is where your truck gets its natural start signal

 

[NDT]

Snowtrac's fingers must be numb. He is telling you that the WTEC controller has to be happy in order to not inhibit cranking. What year is your truck? 97 and before is WTEC 2, 98 and after is WTEC 3.

 

[Hauling the mail]

Thanks so much I'll try this and I'll get back to you I really appreciate your help.

 

[Hauling the mail]

I think they had a surplus of silicon. The starter and the relay are on the frame covered. Ill update in the next couple of days as time is not my side with this truck. If anyone needs cab insulation shoot me a note. I also have a parts truck with 4000 miles on the motor and trans, i can send photos if anyone needs some parts.

 

[DiverDarrell]

Also on the older trucks there is a relay for the starter in the dash. Was the cause of my truck not starting and why I got it cheap at auction. Before I figured out the relay it was started by jumping the starter solinoid to get it on and off the transport truck. Spend some time looking over the panel and swap some relays around.

 

[Rebuilder]

This might not apply to the OP's problem but it may help someone else coming here with the problem I had. My truck began to make a clunk, clunk noise and then start and eventually didn't clunk or start. After a lot of trouble shooting I found that power was getting to the TCM but it wasn't getting back out to 86 on the starter relay. I opened the TCM and found the problem. I was able to start my truck by jumping 87 to 30 on the starter relay and as a short term fix I jumped F and G in the TCM which will bypass the neutral switch.

 

[Suprman]

You opened the vim module and jumped one of the relays. But now you lost whatever safety that relay provided. Could just be a wire or switch issue that the truck does not know it's in neutral.

 

[Rebuilder]

You opened the vim module and jumped one of the relays. But now you lost whatever safety that relay provided. Could just be a wire or switch issue that the truck does not know it's in neutral.

Yep, the issue I found was the G connection to the board is fried and there's no continuity back to terminal 86 of the starter relay. I jumped the two to verify there weren't any other issues with the wires from the TB1 #34 terminal to the 86 terminal on the starter relay. By the time my truck is roadworthy I'll have a new VIM with a working NS circuit.