Hi All,

I hope someone can help me, as i think i'm missing something.

I have a car trailer which has an electric winch, currently powered by a 12v jump pack. I want to change this to an onboard battery, charged by the car when its engine is running.

The car is a Range Rover Sport, 2008 with a TDV8 engine and a 13 pin trailer socket. I have earth on pin 11, and +12v on pin 10 when the engine is running. I believe this is the cabling i would connect the battery to for charging.

Is that it? Do i simply connect pin 11 to the trailer battery earth, pin 10 to the trailer battery positive?

No need for a split charge relay?
Do i need something to prevent voltage from the trailer battery some how getting into the cars circuits when the engine isn't running? If so, what do i need?

Thanks

Matt

Yeap that's about it.

It will be fine if you don't leave the ignition on without engine running.

Stick a 15A fuse in line.

Perfect, thanks

Matt

I do just that on my tipper trailer, works a treat.  Tesla model 3 long range
BMW f15 X5 m50d SOLD!
Disco 5 HSE Lux SOLD!
Evoque Dynamic Lux. SOLD!
RRS HST Sold!
Other gonners, Disco 3, BMW 525d E60, Jag 2.2d X-Type, Merc E240, Audi A4, Peugeot 306, VW Golf GTI 1.8T mk4,Toyota Hilux, Mazda 323f, Escort 1.3!