2002 F150 Relay Diagram. Trailer towing package relay locations page 2 f150online. And the wire that feed the fuse box coming from the battery did mine had a little corrosion creeping up.
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Its essentially a big relay which provides power from the battery to the starter motor when the ignition key is turned over starting the vehicle.
Trailer towing package relay locations page 2 f150online. Trailer tow relay battery charge. I have a f fx4 supercab l. Tech standard motor products wso.