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You should have +12vol on the yellow wire at all times and +12volt on the red when the key is turned on. The black wire has to have ground at all times as well. If that is good make sure the fuse in the back of the radio is good. If that is all good then the radio is defective.
try 4 things........ check your alternator has power and check that your battery is connected properly to the positive and negative terminals if still no success it could be your starter motor is burned out or it could be a faulty immobiliser have all theese looked at and see what happens.
I suspect you have a loose or corroded connection. you should be able to check voltage at relay and if good, jump across from cable coming from battery to terminal from ignition switch. or u can bypass the relay completely by using a jumper cable to go from battery pos to output cable on relay that goes to starter.
try cleaning or replacing battery cables. any corrosion can degrade the voltage. check the wiring behind the fuse block also. (loose wires..) your chevy may also have a fusible link between the battery and the fuse block.
Possibly the alarm cut-off switch? or Ignition key switch (or wires) going bad?
But you mentioned you tried to jump start it and it did turn over?
IF so, you could have severe corrosion or loose connections of the battery cable both at the battery and at the termination points, such as ground and starter motor.
Check that the battery wires are tight and clean at the battery posts and at the other end.
Again the No lights suggests either the alarm cut-off, or an absolute disconnected battery cable.
Finally, it could be ignition fuse, Check fuses. Ignition key switch.
What makes this hard is that you suggest it would turn over with another battery connected. This makes no sense.
I had an issue with the smaller wire off the positive battery terminal breaking inside the casing. Damn hard to find! I would suggest giving the wires around the battery a wiggle, and a feel. Could be a loose connection.
Put a meter on the battery and get a real-world reading. One at the battery by itself with nothing on, and one with the key on and trying to turn the starter motor. A good battery will read 12+ volts at rest and not drop more than a volt or 2 when trying to start.
If that's good, you have a loose or corroded connection between the battery and starter motor. Clean and check all the connections until you find the problem.
I would first verify battery power, Once you have proper power there, either via a good trickle charger or battery replacement, I would check the fuseable links mounted right at the "hot" side of the starter. Just follow the 4 gauge wire from the battery to the 15mm/13mm nut on the starter. Make sure you have power to both sides of the wire with a test light. THis is the only wire that supplies the power for the relay fuse box. So either your not making power, or the power isn't reaching this box. Let me know how you make out.