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The plastic tabs that hold the contacts in can fall out and the contact slip back. If the panel got wet in the past there can be green corrosion on the contacts. The contacts and tabs are replaceable.

jump it see if the truck cranks. If you have power at the breaker panel see if the fuel solenoid has 24v with the dash power switch on.

How do you know its bad?

First thing you need to make sure you have 4 good fully charged batteries and all the terminal connections are clean and on tight. Then go to the breaker panel with a multimeter and confirm you have 12 and 24 volts there on the left side binding posts. Once this is confirmed then we can move...

Under the spare tire. What is the problem you are having?

There is a separate 24v power lead to the starter and solenoid right from the batteries. 12v and 24v go from the batterie into a reverse polarity protection box and then out of that and make their way into the cab. Measure for both voltages there and then at the 12 and 24 volt posts left side of...