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Mike Noc · 22nd May 2020, 19:54

With enough load any cable can spark if a dodgy connection is wiggled and makes and breaks - it doesn't matter if it is on the live or the earth side.

I haven't heard of reconnecting the earths causing a problem, so maybe you have missed one out and it is still floating or the rca cables you have installed may be the problem? The symptoms you describe sound like a K-bus fault.

If you want to test the BCU K-bus, with the driver's door open and key to position II, if you have a message centre fitted the door open icon should be showing. If it isn't then could be a fault with the BCU or associated wiring.

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22nd May 2020, 19:54	#5
Mike Noc This is my second home Rover 75 CDT Manual Connoisseur SE, Rover 75 CDT Automatic Connoisseur SE & a Freelander Td4. Join Date: Jul 2009 Location: Hampshire Posts: 11,548 Thanks: 3,470 Thanked 3,119 Times in 2,247 Posts	With enough load any cable can spark if a dodgy connection is wiggled and makes and breaks - it doesn't matter if it is on the live or the earth side. I haven't heard of reconnecting the earths causing a problem, so maybe you have missed one out and it is still floating or the rca cables you have installed may be the problem? The symptoms you describe sound like a K-bus fault. If you want to test the BCU K-bus, with the driver's door open and key to position II, if you have a message centre fitted the door open icon should be showing. If it isn't then could be a fault with the BCU or associated wiring. . Last edited by Mike Noc; 22nd May 2020 at 20:05..