"maxpower" > wrote in message
...
>i would check out the circuit before cutting and adding resistors and
> regulators, try to keep eveything working the way it was designed, many a
> times i have found the 8 way connectors loose/corroded causing a no charge
> condition. just a simple back probe test to the PCM


assuming you replied to my msg, the lamp was part of those car diagnostic
"features", I think the idea was that if the regulator shorted out it would
light the lamp on the dash... only mine had a I/O short (at some point in
its life) so the lamp never lite, but yet the battery was charging to to
19V... It also doubled up to raise the regulator voltage to about 13V....so
much for technology..... good idea in theory though ;-)

chris





> "exxos" > wrote in message
> ...
>>
>> "Jon G." > wrote in message
>> nk.net...
>> >I have a 91 Plymouth Acclaim, and the alternator doesn't charge the
>> >battery. I took the alternator out and had it tested, and there's
> nothing
>> >wrong with it. I put a new battery in it, but it still won't charge. I
>> >checked the fuseable link from the alternator to the battery, and there
> is
>> >continuity. Therefore, it must be the computer.
>> >
>> > there are 4 connections on the alternator
>> >
>> > L1: direct to battery, positive
>> > L2: direct to battery, negative
>> > c1: small wire, logic, to computer, activates diode
>> > c2: small wire, logic, to computer, also battery ground.
>> >
>> > I want to activate the alternator continuously and put on an external
>> > voltage regulator.
>> >
>> > What must the voltage (and current), to the logic inputs c1 & c2 be to
> do
>> > so?
>> >
>> > I have in mind to run a potentiometer between L1 and c1, and adjust it
>> > until the alternator kicks on.
>> >
>> > The schematic shows that c1 goes to the coil of a transformer in the
>> > alternator, which then goes to one of the diodes (an SCR?)
>>
>>
>> I had a problem with one of my cars in the past with the alternator not
>> charging, what this turned out to be was the ground pin on the regulator
> was
>> going via a lamp on the dashboard, thus giveing a slight volt raise on
>> the
>> ground so you got maybe 13V from the 12V regulator, though it took me a
> long
>> time to work out why my battery wouldn't charge, turns out the bulb went
> on
>> the dashboard, no ground on the regulator, alternator didn't charge the
>> battery, thus car wouldn't start.... strange how a small item such as a
>> dashboard light can stop the car from starting ;-)
>>
>> Chris
>>
>>
>>
>>
>>
>
>