[Jack21]

No, it is one of the relays in the 4 cluster. But you might want to get out your voltmeter and track down where the voltage changes from 10 1/2 to 12. There is a resistance in the circuit that is not supposed to be there. Bad relay contact, bad wire crimp, bad spade lug connection, corroded fuse connection, whatever, and fix it. Resistance also causes heat and the connection could behave like a fusable link under load. POWF!

Or get your high amperage devices out of that mess, and wire them separately through circuit breakers and relays. Relays need to be replaced periodically, so install them somewhere accessable.

Had to do a substantial amount of rewiring. From the firewall foreward, under the dash, and an additional harness to the rear.

Firewall included fan & fan controls, Delco alternator, lights power through separate relays, MSD distributor, box & coil, windshield washer.

Since I used an Ididit column, ignition, lights, wipers/washers were moved to dash. Ididit uses its' own dimmer switch that had to be wired in. Also included heater blower, fan override, rear window defroster (for hardtop), sterio, lighter, and some dash lighting so I could see all this stuff while driving. Speedo uses electric sender that had to be wired. Also installed remote door openers so I could click a button on key ring and door would open. Have about 8 pages of schematics for as-builts.

Rear harness included amp in trunk, rear window defroster, courtesy lights (in hardtop), and power antenna.

Not finished yet. Installed Lucas wiper gearboxes upside down. Works OK, but wipers parked UP instead. Then, the wiper park switch broke. Replacement park switch not available. Gotta replace the whole motor. Will install limit switch and relay on cable end to park wipers. Wonderful Lucas.

Tip on Lucas signal & tail lamps. The little brass tits that hold the lens screws in... Put a dab of wheel bearing grease on them to keep them from from corroding, and causing the steel lamp housing to rust prematurely. The lamp ground is crimped, and will eventually corrode and fail. Solder, grease, and heat shrink this connection.