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Ok, so this sub tank earthing was working for about 6 short trips around town but 1.5 hours into a drive down the coast after Christmas and the sub tank light came on again.
I reset I again twice removing the earth lead from the main battery and it came on again within 15 mins of driving each time.
I added an additional earth lead from the main battery to the chassis and set off on another drive to the coast and it came on again after about 30 mins.
Seems like it wasn't the simple fix I was hoping for.
Should I now start to check error codes on the sub tank control module to try to determine what the problem is?
Also, on that same drive I later turned the parker lights on (due to rain around 3pm) and after driving with parkers on for about 40 mins they stopped working. No parkers, headlights or taillights (brake lights and indicators still functioned). I later diagnosed it had blown the 10a tail lamp fuse in the cabin. Might be unrelated but this is the first fuse its blown in 18 months since I've owned it.
Last edited by Cremulator; 12th January 2020 at 10:05 AM.
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