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1989 240 Battery Drain Troubleshooting

Help, Advice, Owners' Discussion and DIY Tutorials on all Volvo's "mid era" rear wheel drive Volvos.

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Stitch333
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Year and Model: 1989 Volvo 240
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Stitch333

1989 240 Battery Drain Troubleshooting

Post by Stitch333 » Mon Jul 29, 2019 1:16 pm

Hello Forum!
My mechanic and I are going through a 1989 240 and I am sussing out a battery drain issue currently.
When started and running, the battery terminals read 12.2V...
As I do research and start drilling down I noticed something and wanted an expert opinion:
What voltages-Amps should I be reading at the fuse block?
With key in and on, what voltage should I be reading at the alternator small red wire?

Apologies if this has been discussed...a link to threads going over this would be great!

Cheers and thanks!

EDIT: with the key on second pos, car not running...Im getting 11V at the small red lead off the alternator.
Is this the voltage reg on the alternator gone bad?



93Regina
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Re: 1989 240 Battery Drain Troubleshooting

Post by 93Regina » Wed Jul 31, 2019 11:24 am

Make sure alternator is grounded



Stitch333
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Stitch333

Re: 1989 240 Battery Drain Troubleshooting

Post by Stitch333 » Wed Jul 31, 2019 1:36 pm

Thanks for the response!
It's def grounded.



lummert
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Re: 1989 240 Battery Drain Troubleshooting

Post by lummert » Thu Aug 01, 2019 7:05 pm

Have you checked the voltage at the battery with engine running using a VOM? IIRC the small red wire should be connecting to the battery light on the instrument cluster. Is the battery light functioning?


1988 Volvo 760 Turbo Wagon

Stitch333
Posts: 4
Joined: Mon Jul 29, 2019 12:52 pm
Year and Model: 1989 Volvo 240
Location: Western Mass
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Stitch333

Re: 1989 240 Battery Drain Troubleshooting

Post by Stitch333 » Mon Aug 12, 2019 11:28 am

Just a follow up: replaced the voltage regulator (the brushes were nubs)...
now min voltage at small red wire in key pos 2 not running, and 14.5 at the battery when fired up.
Seems it was the voltage regulator that was the culprit...

Cheers!



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