Battery not charging warning message on even though alternator is charging successfully

ALLSORTSMG

MEMBER
1997 JAGUAR XJ8
AUTOMATIC
40,000 MILES

I'm trying to establish why I have the error message telling me the battery is not charging when it is working fine otherwise. 14.2v at battery when running, 12.6v when not running

Alternator is l3b-he type. Ignition in, battery out plus warning light wire out. What signal should be present on this warning light output, please?

any other clues?

Thanks,
Mick

5 Replies

KNOWLEDGE IS POWER

MECHANIC
1,136 POSTS

That info isn't available to me, but id have to assume that battery voltage would come out of that wire and id check for plug damage and continuity in that wire first. Its the gray/white one

Was this

answer

helpful?

Yes

No

Wednesday, March 12th, 2014 AT 5:01 PM

ALLSORTSMG

MEMBER
3 POSTS

Thanks. Any idea where the slate/white wire goes to, is it to a relay or the ecu etc?

SPONSORED LINKS

Was this

answer

helpful?

Yes

No

Thursday, March 13th, 2014 AT 6:01 AM

KNOWLEDGE IS POWER

MECHANIC
1,136 POSTS

The diagram showed it going right to the charge warning light. Seemed strange to me but jaguar does things differently

Was this

answer

helpful?

Yes

No

Thursday, March 13th, 2014 AT 3:59 PM

ALLSORTSMG

MEMBER
3 POSTS

Thanks. Have proved it's the new alternator not producing the 12v output on the lamp circuit. A 12v singnal on that wire (after disconnecting from alternator) cures it.

Was this

answer

helpful?

Yes

No

Friday, March 14th, 2014 AT 11:33 AM

KNOWLEDGE IS POWER