90 Galant -Alternator not charging to battery

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Justsam - 22 Jul 2005 02:40 GMT

we have a 90 galant and the battery keeps getting drained. the alternator
tests good. fuses and relays are good. tried doing a direct wire from the
alternator to the battery and still can't get a good charge from alt to
battery. HELP! out of ideas....

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Nirodac - 22 Jul 2005 07:43 GMT

> we have a 90 galant and the battery keeps getting drained. the alternator
> tests good. fuses and relays are good. tried doing a direct wire from the
> alternator to the battery and still can't get a good charge from alt to
> battery. HELP! out of ideas....

What voltage do you detect at the battery with the alternator running
(engine running). Should be above 13.8 volts. If after you stop
charging the battery the votage drops below 11 volts, check the battery
liquid level if you can, you may need to replace the battery.
How do you charge the battery, if the alternator isn't doing it. Does
the battery hold a charge after it's been charged.

How old is the battery?

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Justsam - 22 Jul 2005 15:06 GMT

the battery is good. we keep draining it and recharging it. the battery
isn't the problem, keeping it charged up seems to be the issue. we can run
the car until it is completely drain then we are out of luck. hence why we
are looking into the alternator. something is going on with the charging
system. the alternator isn't recharging or keeping the battery charged
like it should.

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Nirodac - 22 Jul 2005 16:39 GMT

> the battery is good. we keep draining it and recharging it. the battery
> isn't the problem, keeping it charged up seems to be the issue. we can run
> the car until it is completely drain then we are out of luck. hence why we
> are looking into the alternator. something is going on with the charging
> system. the alternator isn't recharging or keeping the battery charged
> like it should.

Mitsu alternators have a wire attached to the "S" terminal on the
alternator.
This sense wire actually goes directly back to the battery, and is used
by the alternator to measure the battery voltage, which determines
whether the battery gets charged or not. If this wire is open, the
alternator will not output a charge voltage.
Check the alternator wiring, and all the connectors to the battery.
Check for opens and especially corrosion on contacts.
If you have a voltmeter, measure the voltage on the "S" lead, it should
be exactly the battery voltage. The "S" is usually embossed right on
the alternator.

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