If you're getting no power at all when you turn the key to start, try disconnecting the battery and then hook it back up. Chevy has had some problems with an ignition relay solenoid that's mounted under the driver's side dash. Disconnecting power could reset the switch....If that seems to be it, a replacement is around $250. at a chevy dlrshp.
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Looks like the low pressure switch gets power from a 10amp ac fuse. Power then goes to the ac relay which is powered on by the ac heat controller on the dash. Power then goes thru the high pressure switch to the compressor. The ac relay is grounded to the body. Do you have power on the lite and dark green wires going into the relay and is it grounded ?
did u disconnect he ground on the battery,berfore changing th swicth, ther are two fuses / relay . one under dash and one under hood. if ther good ther is a back up fuse to comp. 7.5 read cover to be sure . take out for 10 min. replace and see if it helpes if not u may hav melted wires somewere. solenoid to to starter. good luk claymister
The ignition start circuit is the path from the ignition key in cranking mode to the solenoid on the starter. The path travels through a starter relay and a neutral safety switch before it reaches the starter.
This must be the circuit not working on your car.Make sure battery and starter connections are tight.Check for power at the starter solenoid terminal with a testlight when someone turns key to crank. If you have power there, they sold you a defective starter. If you have no power there then it could be the relay or the neutral safety switch.
Their is a relay/ fuse box under the hood thir is a relay that is probbly sticking corrison on the contacts inside is a commen problem remove the relay and try switching it with a twin relay that controls somethig else in the box and see if it shuts off the fan if so replace the relay avalible at most auto part stores.
another person wrote this, I was trying to find more info for you.
I'm answering my own post so other's may reference. The problem was my
Powertrain Control Moudle (PCM) kept blowing out due to a bad fuel pump.
so if you are inclined to check, your fuel pump can still work and not work correctly. So this needs to be tested under correct measures. More than likely on the truck. But I would locate the PCM and check to see if its blown.