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akwoods

09-20-2024 04:28 AM

Battery light flashing in accessory mode

Hi, about 4 weeks ago I replaced the voltage regulator in my 3 litre diesel because the battery light was flashing (brushes worn). It’s run perfectly since then until today.

The light is flashing again, but this time it’s happening before the engine is started. It flashes as soon as the ignition is switched to accessory and continues to flash while driving.

Previously, with worn brushes, it only flashed if revs were low and even then flashing was intermittent. Now flashing is consistent from the time the ignition is switched to accessories.

I’ve checked battery terminals, wiring/cables in the back of the alternator and the charging point on the firewall. All are ok.

Any other ideas?

EODguy

09-20-2024 05:16 AM

Quote:

Originally Posted by akwoods (Post 1241048)

Starter power cable, maybe? [emoji848]

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Clavurion

09-20-2024 09:08 AM

That charging/battery warning light works with voltage comparator. The light gets battery voltage from fuse F1 to instrument cluster. On the other side is the line from alternator voltage regulator. When the voltage coming from the battery is higher that the line coming from the alternator, the warning light illuminates. For test purposes disconnect the small plug from alternator so you see if it's a cluster or voltage regulator problem.

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