Roadpilot wrote:
What is the start voltage and the end voltage? 13.2 down to 12.7 is one thing, 12.6 to 12.1 is another.
I agree. I have a sticker next to my house battery voltmeter to remind me -
12.8V or more = 100%
12.5V = 75%
12.2V = 50%
11.9V = 25%
Also gotta remember that is open circuit (no load) voltage. If anything is turned on it will pull the voltage down and you won't get a true reading.
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To help me with troubleshooting, I have a clamp-on DC-ammeter. Makes it easy to check individual circuits. If you go this route make sure you get a DC model - some ammeters are AC-only which is useful around the home but not so much the vehicle.
