| Forty Year Old Grounds Can Look Good [message #366507] |
Mon, 06 September 2021 17:54  |
Melbo
Messages: 144
Registered: August 2018
Location: Albuquerque NM
Karma: 0
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Senior Member |
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I had a voltage drop from 13.6 to a range of 8.5 to 9.8. I followed the circuit and tested all along the way. It took me over two hours and a WHOLE LOT of frustration. It was a ground at the disconnect and the converter. It looked good until I took it apart and found it full of corrosion. Took it apart cleaned it up and everything is back to normal. It is a regular comment on this board to check the ground connections.
HTH
Melbo
Albuquerque NM Bus Conversion 1978 MCI 1973 GMC
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| [GMCnet] Re: Forty Year Old Grounds Can Look Good [message #366508 is a reply to message #366507] |
Mon, 06 September 2021 18:22  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Don't waste a lot of time foundering around aimlessly; use these:
General voltage loss troubleshooting rules:
1. Check the voltage at the subject battery, from the Positive terminal to
Ground using a multimeter or a test lamp with an alligator clamp on its
Ground lead and a sharp probe on its Positive lead.
2. Turn on the troublesome item so that it's drawing current.
3. Leave the Ground connected as in 1. above.
4. Using the sharp Positive probe on the meter, check the voltage on the
supply side of each connection and then on the load side. At some
connection, you should find "good" voltage on the supply side and "poor"
voltage on the load side of one of them -- that's where a high resistance
has developed, due to looseness or corrosion.
HTH someone,
Ken H.
On Mon, Sep 6, 2021 at 6:54 PM wrote:
> I had a voltage drop from 13.6 to a range of 8.5 to 9.8. I followed the
> circuit and tested all along the way. It took me over two hours and a WHOLE
> LOT of frustration. It was a ground at the disconnect and the converter.
> It looked good until I took it apart and found it full of corrosion. Took
> it apart cleaned it up and everything is back to normal. It is a regular
> comment on this board to check the ground connections.
>
> HTH
>
> Melbo
> --
> Albuquerque NM Bus Conversion 1978 MCI 1973 GMC
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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