The 75 and ZT Owners Club Forums - View Single Post - Ticking noise from under the bonnet when parked and locked.

macafee2 · 10th February 2021, 08:52

https://caravanchronicles.com/guides...fault-finding/

Although pin 9 shows permanent live, the bypass relay of the car may not allow this to be permanent live. If a caravan is attached, leaving it connected could flatten the cars battery. I think I have mine wired so it is only live when the engine is running.
Pin 10 as indicated should only be live when the engine is running for the same reason.

pin 12 shows as not used, perhaps those of us with towing electrics should wire pin 12
direct to the positive of the battery just for charging.

macafee2

just been and checked, no 12v on pins 9 or 10 without the engine running

10th February 2021, 08:52	#56
macafee2 This is my second home Rover 75 Saloon & Tourer Join Date: Sep 2012 Location: Lincoln Posts: 14,929 Thanks: 1,630 Thanked 3,032 Times in 2,181 Posts	https://caravanchronicles.com/guides...fault-finding/ Although pin 9 shows permanent live, the bypass relay of the car may not allow this to be permanent live. If a caravan is attached, leaving it connected could flatten the cars battery. I think I have mine wired so it is only live when the engine is running. Pin 10 as indicated should only be live when the engine is running for the same reason. pin 12 shows as not used, perhaps those of us with towing electrics should wire pin 12 direct to the positive of the battery just for charging. macafee2 just been and checked, no 12v on pins 9 or 10 without the engine running Last edited by macafee2; 10th February 2021 at 09:06..