Need help with understanding the logic for the battery charge indication system on my 1997 XK8. Let me say upfront this is a conversion project, so the original system has been adapted into a GM system. I’ve used the original SW (gray/white stripe), charge indication wire (as suggested in conversion instructions) with a 1000 Ohm resistor connected (have also connected without resistor and left open with no change), to a switched 12v power source (used the pink/white stripe wire), but the red light in the charge meter and a battery not charging indication remain on. I have checked at the battery (with meter), and with the car running the voltage in ~14.4v.
My question is what are those indicators looking for to recognize charge?
Thanks
My question is what are those indicators looking for to recognize charge?
Thanks
WhiteXKR
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Mar 5, 2026
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Quote:
My question is what are those indicators looking for to recognize charge?
Thanks
Try connecting the grey/white wire going to the instrument cluster to ground. Make sure nothing else is connected to this wire.Originally Posted by deelli
Need help with understanding the logic for the battery charge indication system on my 1997 XK8. Let me say upfront this is a conversion project, so the original system has been adapted into a GM system. I’ve used the original SW (gray/white stripe), charge indication wire (as suggested in conversion instructions) with a 1000 Ohm resistor connected (have also connected without resistor and left open with no change), to a switched 12v power source (used the pink/white stripe wire), but the red light in the charge meter and a battery not charging indication remain on. I have checked at the battery (with meter), and with the car running the voltage in ~14.4v.My question is what are those indicators looking for to recognize charge?
Thanks
Quote:
Thanks for your response...tried grounding the gray/white wire today, no change in the indications.Originally Posted by WhiteXKR
Try connecting the grey/white wire going to the instrument cluster to ground. Make sure nothing else is connected to this wire.