The delayed interior lights have an inline diode, which might have burned to
a direct conductor.
A perfect example: Older Dodge and Mopar vans, when you opened the tail
gate. The front interior lamps stayed off, when the diode burned, the front
interior lamps lit.
Somewhere in your circuit, you have a diode that burned, and allows
pass-through and allows the lamp to stay lit.
D-C circuits go up in current when a ground is loose only when there is a
wound coil; i.e. fan motor, amplifier, charged sub woofer capacitor.
you want weird ?
early 90's Mercury Tracer
no upshift (ECM-controlled unit, F4EAT)
trouble was both back-up lamps burned out + a poor tail lamp assembly ground
with the lamps out, there was enough voltage feeding back into the reverse
lamp circuit that the ECM, which uses voltage on the back-up lamp wire to
detect forward/reverse, decided the car was in R, even though it was going
forward (speed sensor doesn't care)
You would have to admit though:
It was a Ferd?
GM has the smarts to use the P/N switch and the speed sensor.
LOL, Damn them Ferds. But if it weren't for Ferds, I think my bays would be
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