I'm adding a leisure battery to my van so I can run some stuff with out fear of draining the starter battery.
My leisure battery is wired to my starter battery so it can charge from the alternator when driving but is separated by a relay to avoid draw while stationary. I have split a wire from my dashboard which becomes live with the ignition and reads 14.5 volts with the engine running to use to activate the relay, and grounded the other side.
When I connect this wire to the relays trigger circuit (pin 86 I believe), it's voltage drops to 0.6 which doesn't seem to be enough to close the circuit.
Any one know what I'm doing wrong?
I'm using this relay
I have wired it up like this;
- pin 30 positive on starter battery
- pin 87 positive out of relay
- pin 86 live from dash
- pin 85 ground.
Van is mk6 ford transit, wire is white and green one from display behind the steering wheel which I thought might be alternator warning light...
hope that helps.