Forty Year Old Grounds Can Look Good

[Melbo]

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

 

[Ken H.]

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.

> 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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