Outer Limits 4x4 Board

Hi im after some info or even a wiring digram on how to hook up a 24v alternator on my comp truck. i know how to wire the batterys but not sure about the rest of the wiring. does it need a turn on wire ? any help would be great.

cheers steve.

yes, you need an excitation wire.

Had the same issue when connecting up 24v about 18 months ago.
Two batteries in series to make 24v on a closed/separate loop to the 24v alternator.
The trigger/hot wire to activate or turn on the charging needs to be triggered by the normal 12v circuit without connecting the two circuits and causing grief ( or a fire).

I used a 30a relay.... Wire it into the 12v ignition circuit on the switching side so when the engine is running it 'turns on' the alternator hot wire and closes the circuit. I wired in a 24v light bulb, so much like a normal alternator warning light that will illuminate if there is alternator or charge problems.

I think I've explained that ok...

Some 24v alts are self excite and do not requier lights etc.
or
You can get exicter resistors which bolt to the back of the alt and excite that way.

Cheers for the info everyone. After Many hours of serching I found a write up using the realay idea. I haven't got around to doing it yet but hopefully it works out ok.

ifslux wrote:Cheers for the info everyone. After Many hours of serching I found a write up using the realay idea. I haven't got around to doing it yet but hopefully it works out ok.

Any chance you could post a link for the rest of us?

I'll see if I can find it again.

I had the excitation wire on the load side of the 24v isolator. That way I had a visual check that it was on(light in cab) before starting the car. Light went off when the engine was running so I knew it was charging. You could also use the relay but take the supply from load side of the isolator for a check its on.