2005 nissan titan burning smell.

Check voltage from your ground to the constant inputs. You should never self tap a ground, they work loose. There are loads of M6 (10mm spanner size) bolts and threaded taps in the kickwell area. Use one with an M6 ring (1/4" dia.) and scrape away the paintwork underneath. Have you shorted an unfused wire? All the fuses should have blown well before burning.

all fused heavy gauge wires have a 12v+ at the H3 harness. no other h3 harness wires have a 12v+ current when the car is off. no H3 harness wires have a gnd touching, checked contiunity via meter at harness end. gnd wire was moved to a factory gnd bolt. no fuses are blown, old brain is still getting hot, and burning plastic electronic smell their.