For my friend... I will forward him your replies...
Generator on 1995 Plymouth Van, 3.3 L engine.
I just replaced a generator. It is externally regulated. It does not
charge battery at all. I dont have CHECK ENGINE lite going, the
onboard diagnostic codes are 12 and 55.(baterry was disconnected, end
of message) It appearts that generator gives some output, but I can't
measure precisely. System has no shorts and continuity is o.k..
There is a relay in the diagram : Automatic shut down relay. It is in
line with one of the field terminals of the generator. Could that be a
problem? Also if it turns out the whole computer has to be replaced
($512), can I buy voltage regulator for older van and hook it up, to
avoid replacing of the computer.
Mr. maxpower thinks that you are Daniel Stern.
That's the joke.
Max it would seem is seeing things where thy don't exist...
Now, on to your problem.
The external alternator circuitry consists of three wires
1) Large gauge "Red".
This is the output connection, it runs between the alternator and
the power distribution center and ultimately on to battery
positive. Key off there should be battery voltage present.
Key on, engine running, voltage drop across this wire should not
exceed .2 - .3 volts. There -is- a fusible link in this circuit
in between the alternator and the power distribution center.
2) Small gauge dark green/orange.
This is a key on engine running 12 volt feed to the alternator
field winding. It originates at the ASD relay. We know the ASD
is functional because the engine runs, we don't know if there is
12 volts available there until you measure it with a volt meter.
3) Small gauge dark green.
This is the circuit that is pulled to ground by the SBEC
(computer) at pin #20 to control field current.
Jumpering this pin to ground with the engine running should full
field the alternator resulting in full charging voltage.
I'd strongly recommend checking this pin for corrosion and/or the
pin being backed out or anything else that would prevent it
making contact with the SBEC pins.
Armed with this information, if you make voltage checks to make
sure there is voltage available when and where it should be, and
continuity checks on these three wires, you'll probably find the
Yikes. That's...um...odd. Perhaps someone ought to tell Mr. "I'm
not a Chrysler tech and I'm too inarticulate to play one on TV" Beasley
that 3418039AB is not a nasal inhaler and 4883971 and 5013477AA aren't hot
Sounds like the regulator in the BCD has stopped working. It is
possible to install an older style regulator. Dan Stern has outlined
this procedure on this site. It may be that he has also contributed
this to allpar.com.
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