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Battery and oil pressure lights stay on, even with key out…

Customer Question
Battery and oil pressure lights...
Battery and oil pressure lights stay on, even with key out of ignition. Alternator output is great with vehicle running, and battery tested ok (though it was weak from being drained by the battery and oil pressure lights staying on). Problem occurred suddenly two-three days ago for my customer and has been an issue since.
Submitted: 2 years ago.Category: Volvo
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Answered in 1 hour by:
1/26/2016
Volvo Mechanic: Gary, ASE Certified Technician replied 2 years ago
Gary
Gary, ASE Certified Technician
Category: Volvo
Satisfied Customers: 1,823
Experience: Senior Technician
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Hi Greg,

I would say the alternator has battery feed on the warning light wire.

Do the lights go out if you disconnect the warning wire at the alternator?

Gary

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Customer reply replied 2 years ago

I will check tmrw morning and let you know..which wire would this be?

Volvo Mechanic: Gary, ASE Certified Technician replied 2 years ago

Hi Greg,

Disconnect the small wiring connector at the back of the alternator, would have two wires in the connector.

If the 2 lamps go out, the fault is within the alternator.

You'll then need to replace the alternator.

Gary

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Customer reply replied 2 years ago

only have main b+ wire and exciter wire attaching to the back of my alternator. Disconnected exciter wire and lights stay on

Volvo Mechanic: Gary, ASE Certified Technician replied 2 years ago

Hi Greg,

I would say there is a foreign voltage on the exciter wire while it is disconnected.

Are the 2 lamps normal brightness or half brightness?

Can you place a multimeter on the exciter wire while it is disconnected to measure for foreign voltage?

Can you disconnect the oil pressure switch to see if the lights go out?

If there is a foreign voltage, can you then disconnect the cluster to see if the foreign voltage goes away?

I was hoping for you, the fault was in the alternator.

Hope this helps.

Gary

Gary

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