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Old 01-14-2021, 05:15 PM   #1
Join Date: Jan 2021
Default 91 240 GLT 2.3 Charging Problem

Hello all! Iím new to the site, but had my wagon since 2012, and in the past few months it has developed a charging problem. Initially I assumed it was a bad battery, so replaced it, and all seemed dandy, 14.5V with the engine running. However, it has recently started playing up again, to the point where on my way home from work today the lights were dim, the fan was slow, and the radio cut out - on top of this the tach and Speedo were all over the place. After parking the car and shutting off the engine, it would not start again (engine would turn over once or twice before the battery seemed to die). However, after being left about 10 minutes the car will start!
Readings are as follows after todayís drive home.
Battery voltage with engine off, ignition off: 11V
Battery voltage with engine off, ignition on: 10.6V
Battery voltage with engine on, ignition on: 8.47V
Alternator voltage with engine on, ignition on: 8.5V
Iíve read a couple of threads about charging issues, and can say that:
The charging light comes ON with the ignition on and turns OFF with the engine running.
I am getting voltage at the exciter wire
The grounds look ok in the engine bay, as do the fuses (I havenít checked dash grounds)
Any help or advice would be appreciated - the alternator voltage is WAY below what it should be, but why would the voltage when running be so substantially below the voltage when off? Bad alternator/regulator or could I be missing something?
Cheers folks
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Old 01-14-2021, 05:20 PM   #2
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Join Date: Jun 2002
Location: S NJ, a suburb of Phila.

If the exciter wire circuit is ok. You may have a bad or frayed ground wire from the alternator case to the engine. Check with an ohm meter to see if it's low resistance to a good ground. But if the ground is ok then yes, bad regulator or diodes in the alternator. Brushes may be worn out. You have been driving the car long enough to have worn the brushes out.
1982 242 turbo. 338k miles. MVP coilovers and 3" exhaust. Flowed 405 with a V15. Cossie turbine housing with upgraded compressor housing. 90+, IPD remote oil filter. Some other goodness, too. Been lots of fun over 25 years. Restored in 2k. Now ready for a 2nd restoration.

1993 245 Classic, 430k miles, enem V15. IPD bars and chassis braces. Simons sport exhaust from Scandix. sbabbs ezk chip. Been a good road warrior. Genuine Volvo rebuilt leaky M47.
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Old 01-14-2021, 05:57 PM   #3
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Join Date: Nov 2002
Location: California

This is a common topic. Search.

Test lamp to disconnected exciter wire, key on, illuminate?

Loaded voltage drop test the ground wire.

Inspect the brushes.
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