Question: 6.2L: Low voltage at meter and weak starting - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
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Electrical Discuss anything related to OEM & aftermarket electrical devices including: stereos, speakers, video, batteries, starters, the body control module, lighting, etc.

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Old 08-11-2019, 03:45 PM   #1 (permalink)
pinne65
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6.2L: Low voltage at meter and weak starting

When it rains it pours. I replaced my starter yesterday. That was preceded by a thorough engine clean and subsequent drying.
I did have the starter tested at the store and all was good. However, when I turn the ignition on, the voltage is really low at the meter in the car and I can barely start. Voltage measured at the batteries is 12.5V both connected and disconnected. With the engine running both batteries show 14.5V. There's a 10-20 mA draw with the ignition off. With the ignition on there seems to be a .5A draw. The weird thing to me is that it looks like something is drawing immediately after I turn the engine and ignition off. At one point I measured 3.5A. This current eventually tapers off to 10-20mA. Not sure if this is normal.

I'm electrically challenged, so any clues are as usually greatly appreciated.

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Last edited by OkDually; 08-11-2019 at 04:06 PM. Reason: title adj
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Old 08-12-2019, 12:25 AM   #2 (permalink)
Ron Nielson
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As long as you can get back to 10 to 20 miliamps within 15 minutes or so, yu are doing just fine. And of course, the quicker you get past that 3.5 amp draw, the better off you are. I think you might benefit from doing voltage drop testing. See you tube videos about this posted by South Main Auto. At a minimum, remove, and clean with a wire brush both battery terminals, both ends, and the cable from the alternator to the battery.

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