the alt is grounded to the block and also runs a ground from the alt to a wiring harness. However, you can always set up your own ground, run some 4 or 8 guage wire from the alt to the body or set up a ground wire system as I did.
reason I'm asking all these questions is the power "post" on the alternator is glowing a bright orange. Already melted away the red cap that covers it. :tongue: I'm going to check grounds first then move onto switching alternators. I don't have my FSM so it's kinda hard to trace things. :-\
Some people seem to lose the smallish 8mm or 10mm bolt for the black ground wire. It's on the right side of the alternator, several inches below the red-capped power post.
There is also another ground on the left, directly above the alternator pulley where the tensioner mount bolts into the block, sometimes covered by a rubber flap. The ground there is sandwiched behind the upper bolt.
No problem. I just re-read my description, need to clarify.. the small grounding point on the right is more to the right.. the bolt head would actually face the exhaust manifold, not the front of the car.
If the bolt is missing, your ground strap should just be hanging off the harness somewhere, hopefully (!)
One more thing. Check to see that your upper radiator hose and/or the metal outlet is not leaking coolant down into your alternator. In any case, your alternator is probably due for a rebuild.
You guys need to check the harnesses out. Ohm out the wires. THe ground, voltage and charge wires all come through the wiring harness. If they are old the terminals could be falling of the wire or the wire can break. Take some time and trace the wires back to run some ohm checks using a digital multi meter. THe ground is on the driver side of the alternator (back side whatever) has a small 8mm bolt that holds the cable on. You can run your own ground cable from that point using some 8 gauge wire to any bolt that goes into the chassis on the passenger side. One thing you may want to do is pull the alternator and have it checked for proper voltage. It may be over voltage or something causing your problems.