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

Tiny
ALLSORTSMG
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  • 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
Wednesday, March 12th, 2014 AT 12:34 PM

5 Replies

Tiny
KNOWLEDGE IS POWER
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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
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Wednesday, March 12th, 2014 AT 5:01 PM
Tiny
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Thanks. Any idea where the slate/white wire goes to, is it to a relay or the ecu etc?
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Thursday, March 13th, 2014 AT 6:01 AM
Tiny
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The diagram showed it going right to the charge warning light. Seemed strange to me but jaguar does things differently
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Thursday, March 13th, 2014 AT 3:59 PM
Tiny
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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.
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Friday, March 14th, 2014 AT 11:33 AM
Tiny
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Glad you've found it and youre welcome
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Friday, March 14th, 2014 AT 2:39 PM

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