Finally got our 94 YJ (2.5) back from months of rebuilding after a frame swap, lift and everything seems to run alright. Except everything electrical is going crazy. i would drive it anyway out of spite but im rather afraid of the temperature gauge, because we had some cooling issues when we first swapped in the engine that a new thermostat SEEMED to take care of. i'm told that i need a fan shroud to keep it at the right Temp before i actually drive it any distances. Anyway, when i turn it on, it starts, runs and drives fine and seems to be circulating water fine as both hoses are hot. I'm not as concerned about the temperature but i can't tell because of my completely seperate electrical issues.
all gauges act 'funny' as in tachometer will drop immediately to zero when anything electrical is activated like turn signals or headlights or radio or whatever.
the temperature gauge is especially worrisome as it starts out normal then will peg either all the way right, or fluctuate wildly with activation of electrical things
the voltmeter seems to be functioning alright, but it drops very sharply with the activation of anything electrical, and reads very low (like 9) when ignition is on but not started; but cranks just as strong as ever.
The horn when pushed sounds like it is trying to sound, but is very choppy and weak, as if there is not enough power for it.
As im sure you can tell, i know next to nothing about electrical stuff. Weve taken the whole dash apart and pulled every fuse and every relay trying to isolate the circuit causing the problem. My grandpa theorizes that its shorting somewhere but we have no idea where to start looking for it and like i said we have torn the whole thing apart. Again, this is a recent problem developed after we got it back from the shop.
PLEASE HELP ME!