SR toyta hilux ignition wire

Thanks qubert. Also found that the radio wire meets the needs. What I don't get is that to turn the radio off when starting the engine they apply power to both sides of the radio. So rather than cut the power to the radio they apply power to the wire that would normally be the earth. I understand how they do it (also used for lights on alert) but not why they do it this way.

Any ideas?

To disconnect the aux bats from the cranking battery when the starter is hit.

Sorry you have lost me, why don't you want to disconnect the aux battery when starting?

Opps!! should of read .....why don you want to disconnect the aux battery when starting?

Try again.....why do you want to disconnect the aux battery when starting?

The mates aux batteries are those in a camper. Wire size to allow low (ish) resistance for charging would be around 6-8 B&S over this run- front to rear of vehicle. Wire size to allow current draw necessary for starting an engine would be substantially larger than this.

Most people don't need the aux batteries (in this situation) to be used for cranking. Most probably wouldn't even use the aux battery under a bonnet for a cranking battery. In these cases you can get away with much smaller wire size. It's a lot less complicated and far cheaper to disable the aux battery from the cranking circuit.

He already has a high current relay and wanted to use this rather than purchase another smart solenoid. Hence the need to find a suitable switching wire.

The power will come from th start battery in the front, even if it is a bit low it will make no difference.

I think you are adding stuff that is not needed.

You will need to use an 80 amp relay to do what you are trying to do.

Spend $80.00 and buy a Redarc Smart Solenoid.

Do it right the first time.

A Redarc solenoid would be easier but they aren't $80, if you can get them for a total cost of $80 you're doing well. However as per my post he already has the relay. Not sure what you're saying, initally you say I'm adding stuff that's not needed, then you say I need a 80 relay (he has one) or a redarc.

The power won't come only from the start battery unless you "make it so". If the start battery is low, the aux batteries are full (ish) and the wire can't handle the current draw you can potentially cause problems. That's to the wire and altenator.

Thanks all the same.

http://cgi.ebay.com.au/REDARC-SMART-START-12V-100A-DUAL-BATTERY-ISOLATOR-4X4_W0QQitemZ190232325705QQihZ009QQcategoryZ30862QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

$95.00 includes free postage.

But I have to admit to not understanding what you're wanting to do!!

Sorry Austravel, disregard my suggestion - had a few wires in my brain crossed :-)))

Phil please see my reasoning above.

Thanks for the tips.