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car won't read battery power 140-160

posted by  Niel on  Fri Sep 26 01:22 CST 2014
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last visit: Thu Oct 23 12:56 CST 2014
[RELATED]

It's been a while, but I think the relay on the side is for the headlights.

Check the connections on the starter motor, and you can also measure for a voltage drop across connections when turning the engine over (i.e. probe on cable strands and on bolt at each connection and see where you have a large voltage drop).

My S40 had a similar issue but regarding not charging properly which no one could find, and I've discovered it was a connector crimp between the alternator and the starter motor that was not absolutely perfect. It takes very little to cause a voltage drop. I've fixed the crimp and a few years later the issue never came back again.






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