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Message: <blockquote data-quote="road runner" data-source="post: 983011" data-attributes="member: 5116">Good job and thanks for sharing. Mine used to show 14.1 on datel up until 2 years ago. This spring I replaced the battery and no joy. I see low to mid 13's like yours did. It still runs OK so I haven't got serious about diag, but I'll be watching this thread.I'm sure Alan or Fred had you check, but have you done a voltage drop test between the RR and battery? Maybe I'm calling it the wrong thing. I'm not saying to measure volts at each spot to see the difference. You put one lead on the RR wire at the RR and the other on the battery. Do this on both the pos. and neg, side. With the meter set on volts you should see 0 ideally, less than 1 volt is OK. This test is checking the condition of the wiring between the 2 points. If the wiring is poor, or too small then voltage will go threw the gage that you have hooked up in parallel. If all is OK no volts or very little will go threw the gage.From the results you got bypassing the harness that says that volts would be going threw the gage in the test. now you can do the same test, but do it on every leg or part of the pos. side to find the culprit. You can check every connector and piece of wire this way.</blockquote>