99 A6 Avant potential grounding problem
With battery normally connected, the car won't turn over, just the starter solenoid clicking, trying to get enough power to turn over. If I try to jump the car with the leads on the positive and negative terminals of the battery, the same thing happens. If I run the positive lead to the battery and the negative lead to the engine removal mount with jumpers, the car starts perfectly fine with no hesitation.
I have a brand new battery, brand new starter, and brand new alternator, as well as a brand new cable from the frame to the negative post of the battery as of today. All multimeter numbers from the above locations read fine if not a bit low but still more than enough to crank the engine.
I can only think that it is a cable in the harness from the starter/alternator, to the battery. Every connection is tight with no rust as I just cleaned al connections today and during installation of components. I don't remember a ground cable from the alternator to the frame of the car, is there supposed to be one? I just thought of that. Would that cause the problem?
I am out of ideas and will bring it to the shop tomorrow if I can't figure it out. I am just seeing if someone had this happen to them and if they had a solution.
Also, I swapped the starter 3 days ago and it turns just fine for two days before this occurred.
I am going to go through all the grounds tomorrow, just so lost right now.






