[68z28kk]

Always check the connecror behind the battery first.The small wire from the positive cable attaches to it before it goes across the core support and attaches to the horn relay. It is commonly rusted or corroded and can cause your problem. That wire and connector is the main feed of electricity to everything on your car except the starter itself. The wire to activate the starter solenoid comes from that wire and will cause your problem. You can run a 10 or 12 gauge jumper wire from the positive battery cable to the terminal marked bat. on your horn relay when it's hot and won't start. If it starts with the jumper hooked up then you need to repair the connector behind the battery. Clint