When I start the car I get the 3 lights : ABS, trans oil and diff oil. Its a 1990 300zx. The battery gives 11.8v with lght,fan,aircon on other lectic stuff on. Whwn I turn it off i get 12v.

Sometimes when I rev the engine he lights go away and the battery/alternator goes up to about 13.5v

I have checked the fuses by the battery and cleaned them. No difference. The three lights are alway on now.

 

I think the altenator is dying, but if there is somethig else I can check please let me know?

When I start the car I get the 3 lights : ABS, trans oil and diff oil. Its a 1990 300zx. The battery gives 11.8v with lght,fan,aircon on other lectic stuff on. Whwn I turn it off i get 12v.

Sometimes when I rev the engine he lights go away and the battery/alternator goes up to about 13.5v

I have checked the fuses by the battery and cleaned them. No difference. The three lights are alway on now.

 

I think the altenator is dying, but if there is somethig else I can check please let me know?

When I start the car I get the 3 lights : ABS, trans oil and diff oil. Its a 1990 300zx. The battery gives 11.8v with lght,fan,aircon on other lectic stuff on. Whwn I turn it off i get 12v.

Sometimes when I rev the engine he lights go away and the battery/alternator goes up to about 13.5v

I have checked the fuses by the battery and cleaned them. No difference. The three lights are alway on now.

 

I think the altenator is dying, but if there is somethig else I can check please let me know?

 

A fully charged battery will read around 12.7VDC open circuit.

An alternator at idle generally indicates around 14.2VDC.

The other thing to check is AC ripple voltage.

Here's a link:

When I start the car I get the 3 lights : ABS, trans oil and diff oil. Its a 1990 300zx. The battery gives 11.8v with lght,fan,aircon on other lectic stuff on. Whwn I turn it off i get 12v.

Sometimes when I rev the engine he lights go away and the battery/alternator goes up to about 13.5v

I have checked the fuses by the battery and cleaned them. No difference. The three lights are alway on now.

 

I think the altenator is dying, but if there is somethig else I can check please let me know?

 

A fully charged battery will read around 12.7VDC open circuit.

An alternator at idle generally indicates around 14.2VDC.

The other thing to check is AC ripple voltage.

Here's a link:

This does sound like your alternator is giving up, sorry. I take it that the alternator belt is tight?

This does sound like your alternator is giving up, sorry. I take it that the alternator belt is tight?

My alternator runs at 14.1 or .2 constant.

My alternator runs at 14.1 or .2 constant.

Alternator is DEAD.. That's the second alternator i've killed over 10 years. Thanks for the link :)