[IverRover]

Originally Posted by HarryM1BYT

Most installers these days use a voltage sensing relay, mounted in the boot area, rather than the warning light switched type that you have. The reason being that the later type involve more work to install and can be tricky on a modern car to actually use.

The feed you mention behind your glove box, is probably not even connected to the engine fuse box, it will be tucked up out of the way under the fuse box and will need a crimped terminal fitted and plugging in to the underside.

Can I suggest that for best results you do things this way?

Connect the above feed to the fuse box via a 30amp fuse, in the box - the correct fuse way for a trailer supply is marked.

Run at the minimum a 4mm or better a 6mm main feed from behind the glove box into the rear of the boot, close to your tow bar. That will then be an unswitched permanently live feed.

Add a voltage controlled relay on the end of it, with two outputs, one to the fridge circuit, the other to the caravan battery charging circuit. Insert a fuse of 20amps into each of those two circuits, so if there is a fault on one circuit it doesn't blow both circuits.

The larger than normal feed, makes for both your fridge and battery to receive higher voltage, less volts drop along the relatively long cable run. Both will work much more efficiently, with less voltage drop.

The voltage sensing relays sense the voltage rise, when the engine is started and fall when the engine is stopped. It may need some fine adjustment via a tiny screw, to operate correctly once fitted.

Thanks for that. Off to get the relay and wire you suggest now.