92 acclaim check engine light goes on & off with radio or heater

Hi
My wife's 1992 plymouth acclaim's check engine light is coming on
whenever the radio or heater is turned on, It goes out when the radio
or heater is turned off. Is it time for a new alternator or does the
problem lie elswhere?

thanks

Dutchie

 

To check the computer codes:

With the engine off, switch the ignition key on-off-on-off-on,
leaving it "ON". Do not
go to "start", just "on" during this procedure.

Watch the "Check Engine" or "Power Loss" light. It will turn on, then go
off, then will begin to flash-out any trouble codes that have been stored.
For instance, if it flashes:

flash <pause> flash flash
<long pause>
flash flash flash <pause> flash flash flash flash flash
<long pause>
flash flash flash flash flash <pause> flash flash flash flash flash

Then you have a 12 (one flash followed by two) a 35 (three and five) and a
55 (five and five). 55 means "end of codes" or, if by itself, "No codes
stored. Check the codes and report what you find.

 

Thanks for the prompt reply!

I get a 12 a 47 and then 55

does that help at all??


Dutchie

 

Yep.

12: Start of codes
47: Line voltage too low
55: End of codes

Go get your battery and your alternator load-tested, and carefully inspect
all three topside connections on your battery cables (positive and
negative cable terminal clamps on the battery, and the plastic pull-apart
connector about 7" downstream from the battery in the positive cable). You
will probably need a new battery; yours probably has a dead cell.

 

Thanks a lot for the information/advice it is greatly appreciated!

I swapped out the battery with the newer battery from my vehicle ( less
than 6 months old). I also cleaned the battery cable terminals. No
change. I did notice a few things. With the car idling the
alternator/battery gauge sits at 3/4. when I turn on the heater it
drops to less than 1/4 and the check gauges light comes on. The next
time I do it it stays at 3/4 and no check gauges light. If I keep
monkeying around turning on the high beams or the heater it will at
some point drop down to less than 1/4 and the check gauges light comes
on again. The problem does not seem to be consistent.

Tomorrow I will take the alternator in to be tested. Is there anything
else I can do in the meantime?


Thanks again

Dutchie

 

All *three* of them?

Intermittent problems are always fun to diagnose. Remember to *test and
diagnose*, not just throw parts at the problem.

Have it tested at an auto electrical house -- a starter/alternator place
-- not at the parts store.

 

Just to let you guys know.
I finally got around to getting the alternator checked and sure enough
that was the problem. New alternator and the problem is gone. Thanks
for all the input. Very much appreciated


Dutchie