Posted by JMOR on March 13, 2019 at 08:00:06 from (76.186.117.99):
In Reply to: Can a bad alternator posted by flying belgian on March 12, 2019 at 17:54:27:
Quoting Removed, click Modern View to seeIf the GM 10SI and connected with 3 wires, it's parasitic drain is measured in micro-amperes (millionths of an amp), your battery will likely self discharge sitting on a shelf not connected to anything before this tiny drain will kill it. Call it a smallish 60 amp-hour battery & draw say, 500 micro amps from it: 60/(500/1000000)= 120,000 hours or 5,000 days or 14 years. No diode that you can add will change that drain in the Sense wire. If a "one wire" version, the draw is a little more, but you can see that even if double the above, it will still be insignificant. Some "one-wire" units drain more than others. If alternator is killing your good battery in days, then the alternator is bad.
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