Duel Battery Solenoid

**Tins** · 16th December 2021, 09:13 AM

Originally Posted by Tombie

I hate it when batteries fight

I see what you did there. I remember when fuel systems were at each other's throats.

**drivesafe** · 16th December 2021, 02:04 PM

Originally Posted by Grahame Roberts

Have a look at Sidewinder products. Aussie made for just under $70.

They are not Australian made, they are Chinese!

**d2dave** · 17th December 2021, 11:35 PM

Ok. we have decided to go with the basic solenoid connected to an ignition switch feed.

Phillip. Where have you sourced your 12 v feed.

I have had a thought. Could it be powered off the fuel pump relay, as it only runs with engine running.

To keep the currant draw small, I could use the fuel pump relay to power another relay which would power the solenoid.

Thoughts on this idea anyone?

**PhilipA** · 18th December 2021, 07:13 AM

Phillip. Where have you sourced your 12 v feed.

From a piggyback fuse from the interior fuse box which is ign on triggered . I love those piggyback fuses.

I cannot remember which one but there are several that are only on with the ignition.
Just look at a wiring diagram. Maybe electric mirrors or sunroof or something like that.
Regards PhilipA

**onebob** · 18th December 2021, 09:12 AM

Originally Posted by d2dave

Ok. we have decided to go with the basic solenoid connected to an ignition switch feed.

Phillip. Where have you sourced your 12 v feed.

I have had a thought. Could it be powered off the fuel pump relay, as it only runs with engine running.

To keep the currant draw small, I could use the fuel pump relay to power another relay which would power the solenoid.

Thoughts on this idea anyone?

If using "piggyback" type fuse holder to tap 12V the info below is from a post of mine way back in 2012

Fuses 24,25,27,28,30,31 are 'ignition on' power sources...

Fuses 15,16,18,19,26,32, are 'accessory on' power sources

Fuses 1,2,4,5,6,7,8,12,13,20 are 'ALWAYS powered on"

I run my UHFCB off fuse 5 (unused on mine but reserved for Daylight Running Lights on the posh models)

Refer to the attached fuse box diagram for fuse positions and also for an easier to access 12V source that may be unused and available on your vehicle.

Disclaimer: This info is from my own scribbled notes, they're accurate for my D2 though can't vouch for other D2s so check before using - and as always all care was taken but no responsibility accepted.
passenger fuse box.jpg

**d2dave** · 19th December 2021, 09:53 AM

Thanks Phillip.
I will easily find one from the fuse box.

I was asking the question in the hope that there was one some where in the engine bay, to save the hassle of having to feed a wire through the firewall.

**PhilipA** · 19th December 2021, 11:02 AM

I was asking the question in the hope that there was one some where in the engine bay, to save the hassle of having to feed a wire through the firewall.

There is a big grommet under the steering column, which exits underneath the booster. You cannot see it from the engine bay.
You have to peel back the insulation to see it from the cabin..
To feed the wires I use an ALDI drain cleaner to push through from the cabin with the wire attached. I have several wires going through there Including boost gauge , EGT, temp gauge and more.
Easy Peasy once you know it is there.
Regards PhilipA

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