I am really struggling to solve this electrical issue and dont have enough knowledge to figure this one out by myself.
I had an alternator go out initially. I just replaced it as it was very old so It seemed normal that it was its day. a couple days later the replacement alternator goes bad too.
After poking around I put a multimeter on the battery to see if the second alternator was putting out any charge. the multimeter reading was odd. It will read 12.xx volts when you start the engine, then the reading will start jumping all over the place
7v, 3v 12v 8v It jumps constantly to random numbers ranging from 0.5v-12.5v and becomes more sporadic the longer the engine runs.
I thought I would start with bad grounding so I replaced both battery cables and the battery with a spare. no luck
I began replacing all kinds of parts since I have spares of EVERYTHING an nothing has fixed the issue
I have now replaced the entire wiring harness including the engine harness, efi harness, and main harness
entire ignition system
cleaned and doubled up grounds
removed/unplugged all accessories
and much more
I just keep getting this sporadic voltage reading that worsens the longer the engine runs, until the motor eventually dies(roughy 10 minutes).
I dont know what the next step to take is with electrical problems, you guys got any ideas where to start with a voltage problem like this??