My 1996 XJ 4.0 has, for many years, had a problem with the power door locks where the M13 fuse (20A) would blow and the locks would cease to function. Both driver and passenger side switches work and I can hear the relays operating, but the solenoids aren't being triggered.
Mechanics have given up trying to isolate the problem (and I gave up replacing fuses), but I thought I'd give it a go tracing out the probable short. A spanner in the works is that the fuse doesn't blow immediately on use, but rather some time up to a week after, which makes me think it might be a worn cable intermittently shorting out on the chassis somewhere while the vehicle is in motion.
Looking at this Autozone Wiring Diagram #31
I see the only wire shared between both lock/unlock relays is the "LT GRN" straight to the fuse. Would I be correct in replacing that wire with new connectors and 14-gauge AWG (as per SirGCal's post here
) wire as an initial repair step?
In my Haynes manual, I see splice R6 / 99 20BK (I assume that means 20 amp, black, so probably ground) as being a related cable, so I'm not sure if that might also be a place to swap out.