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Was the junkyard harness out of the same year truck. I put the wrong year harness in a truck once and the gauge would flutter, don't know about the cab light since I never got around to fixing that. I added a quote from NumberDummy showing the different harness.
Originally Posted by NumberDummy
D8TZ14305A .. Alternator Wiring Harness / Use with 70 amp Alternator / Use with Oil & Amp Warning (idiot) Lights / Obsolete
D8TZ14305B .. Alternator Wiring Harness / Use with 70 amp Alternator / Use with Oil & Amp Gauges / Obsolete
D8TZ14305C .. Alternator Wiring Harness / Use with 40/60 amp Alternator / Use with Oil & Amp Warning (idiot) Lights / Obsolete
D8TZ14305D .. Alternator Wiring Harness / Use with 40/60 amp Alternator / Use with Oil & Amp Gauges / Obsolete
All fit: 1978 F100/350 I-6 or V8 / D8TZ14305C & D also fit 1978 Bronco.