New KDS Box...No Wait Light

I’ve been having starting issues when really cold all winter. Truck had a Nartron Smart Start box. Wait light worked normally. Batteries are brand new yellow tops with a trickle-charger.

So, I replaced glow plugs and temp sensor and problem continued. I had a block heater installed and truck would always start after being plugged in but would not when not plugged in.

Obviously, I want to make sure I can start the truck regardless of temperature and without having to plug in block heater.

Ordered a new KDS box and matching temp sensor. Disconnected batteries. Installed box and sensor and refilled lost coolant. Now wait light does not turn on at all.

Opened the old Nartron box and there is no visible damage. In fact it all looks brand new inside.

I am starting to believe there is a wiring problem in the harness somewhere but electrical diagnostic is probably more than I am capable of.

I am interested in any troubleshooting ideas.

I am also interested in a referral to a HMMWV mechanic in Utah I could hire to diagnose the problem.

Thanks in advance.


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Yes, replaced the thermostatic switch with new. Called it temp sensor in my post by mistake.

Thanks for the referral, Tooele is not far from me.


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