voltage at starter

[Gandalf]

Use a long piece of (standard size) stranded wire to "extend" the +12v probe on your meter back to your battery terminal (a piece almost as long as the vehicle really speeds up trouble-shooting this stuff). Be sure to protect any connections with some duct tape or similar. This will allow you to move around your car with the meter in-hand and check voltage at different points by using just the ground probe. Start testing at the battery (through the long wire) and check you have the same voltage you mentioned at the battery previously. Use that as your reference. Then move out from there using that long wire to check different points on the chassis, engine etc. See where differences show up and that should help narrow down the issue.

This assumes a ground issue. You can do exactly the same for the +12v side by extending the ground cable.



Let us know what you find.
G.