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Old March 29th, 2020, 20:53   #10
Veteran Member
Join Date: Nov 2012
Location: FL
TDI(s): 06 Jetta

Originally Posted by Maintainer View Post
You need to check the ground side too, with your voltage drop test. I had same problem as you. Main ground cable at the transmission was my issue. From your post, you mentioned testing the positive side but nothing about the negative side.
I checked the main ground and the 3 smaller ones under the air cleaner. They were all super clean for a 300k car.

I may have found the issue. I was getting .40V drop between the alternator post and positive battery post. That is too much to me. I found a large drop on the red positive battery cable between the battery post and fuse box. I wiggled around the cable in different areas and all of a sudden the voltage drop went away and I was getting 13.90V across the battery posts.

I suppose if I get the issue again I will be looking at that cable again.
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