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test it, the 2 big terminals are for the bat. and the starter. you have one or two small ones, using an ohm meter, check that you do not have any juice passing through the solenoid... the big ones (take off all wires) put 12v to one of the small terminals, did you hear/feel a click? now ohm the big terminals. the reading should be close to 0. If you did not feel a click try the other small one.

All that is inside your solenoid is a electro magnetic switch. when you turn your key to start, the switch (plunger) is pulled agents a spring to make contact and transfer power to your starter. (a small current turns on and off a larger current)

Things that can go wrong. the contact points of the larger current get pitted (wore out) or the windings of the small current break (wear out)

Right now I can not remember what the other small terminal do. I think it is hot (12 v) while you are starting, but not quite sure. You will not hurt anything by putting power to it if everything is disconnected.

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12y ago
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Q: How do you know if the solenoid of your truck it does not work?
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