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My temp needle will behave like an ammeter when i have the turn signals on. It dances around and i also have alternator whine coming from the radio when on AM.

The battery is grounded above the oil filter, there's another ground from battery to hood. I cannot find the engine ground, where is that supposed to be? On my e30 i have a ground from above the oil pan to the frame.

Also, would the above issue be caused by a bad ground?

If your only ground to the frame/sheet metal is to the hood, that's not good. Get a ground strap and attach it between the block and the frame. Too many grounds isn't a thing.

Where on the block would you attach a ground strap on?

There are probably lots of options, but I attached mine to one of the bolts holding the bracket for the throttle bellcrank on the block . It's easy to access. The other end I connected to the wheel house bracket that holds the coolant overflow tank (and the combo relay on my 81). Check for a good ground electrically to the chassis before connecting to the block. Also, if you choose this location, be sure the ground strap doesn't get tangled into the throttle linkage.

On my 1976, the ground strap is right behind the alternator.



It is the black cable in the middle of the photo that is disconnected from the block.

Mike