SOURCE: 2005 Chevy express Fuel pump relay meltdown 6.0L
The horn relay was shorting out but not activating the horn. When you swapped it out it sounds like the fuel pump was running all night killing the battery. It sounds like the relay had a dead short inside and melted itself to the fuse box. Depending on the extent of the damage you might have to replace the fuse box as well as the relays.
SOURCE: 2000 chevy express 1500 van having starting issues
Start with fuel system. Listen for fuel pump humm at fuel tank No humm check wiring to pump for power. Then check for spark at plugs and wires. Remove wire from coil and hold near engine and see arch when you crank. No arch. Replace ignition Modular inside distributor cap or cap or rotor
SOURCE: Reverse and interior lights out, chevy express van
Fuse block under the hood. Driver's side, under the brake master cylinder. Number 18. TCB#2. Replace the fuse.
There is an under-engineered ground in the reverse circuit. If you back up with the dome lights on, it could blow that fuse. There should be some extra fuses under the cover of the fuse block.
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