Isolator Question

[jackmac]

Quick question regarding wiring for my FIA switch. I know this is a topic that's been covered to death all over, but mine is a bit different.

I am using the relay from an X-Charge system on the main battery cable, the trigger wire for this go through the FIA switch thus meaning I don't have to run 40mm^2 cables through my cubby box.

I understand how to wire the switch, except for the resistor. I know one side of the 1st spade terminals goes to earth through a resistor to prevent damage to the alternator, but not sure where the +ve side for this needs to come from? Obviously I can't take a feed from the large terminal on the FIA switch because in my set up that's not actually the battery cable, so where does it need to come from? Do I take it from the -ve side of the X-Charge relay, or do I need to take it off the starter motor?

Hope that makes sense... I'll knock up a diagram if not!

[Paul Woodward]

It would need to connect to the vehicle side of your relay, or the starter or the alternator.

Are those relays rated for the amount of current involved?

[jackmac]

Yep, it's a 200A relay I think and the draw on it should never go above 100A. Winch is running through a much higher rated one that that.

On the battery box I have a mechanical isolator which is the last thing before the battery cable connects to the starter motor, so I could put a wire from the engine side of that isolator then?

[jackmac]

Urgh just read your post properly, I'll connect it directly to the relay. Thanks