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I'm measuring the voltage with a multi-meter directly at the B+ terminal on the back of the alternator (see attached - green circle). The battery voltage at X12/3 on the fender is fine and I put the wire brush to all the terminals just to make sure. I pulled up the carpet on the driver-side to access X4/31 and check the voltages there but it is covered with some sticky felt material for protection - I think it is probably OK since the whole area is very clean and dry. I wire brushed the terminals at the starter (M1 in the diagram) as well as the connection back to X4/31 from underneath the car just to be sure they're OK as well.
Do you know physically where the connection between the starter and the alternator resides (blue square in diagram)? It is not referenced to a connector block so I am assuming that it might be splice within the wiring harness...
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Scott C.
2006 E320 CDI (120k miles)
FOR SALE: 1998 E300 Turbo Diesel - Black w/Tan Leather - Euro delivery (236k miles)
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