Duel Battery Solenoid

**d2dave** · 13th December 2021, 09:51 PM

I have to wire up a duel battery on my sons D2 Td5. The 2nd battery will in the rear RH bin.

ATM he is on a tight budget so I was going to go the cheap option with a starter solenoid.

CONTINUOUS SOLENOID DUAL BATTERY BATTERIES 12V VOLT SOLENOID ISOLATOR 200A AU | eBay

I have been using one of these on my D1 hassle free for about 16 years.

I have it wired to the alternator so it only connects when engine is running and I do have the diode to stop back currant

My question is this. Are there any issues using one of these on a D2 with all the electrical stuff that a D2 has over a D1?

I have a Drivesafe one in my own D2.

**Tombie** · 13th December 2021, 10:15 PM

I hate it when batteries fight

The set up will work, and the capacitor will prevent the surge so that’s fine.

A simple VSR would be easier if he can stretch to it.

**d2dave** · 13th December 2021, 10:25 PM

Originally Posted by Tombie

I hate it when batteries fight

The set up will work, and the capacitor will prevent the surge so that’s fine.

A simple VSR would be easier if he can stretch to it.

Thanks Tombie. I was also looking at one of these but the cheap price concerned me a bit. However, it it doesn't last not a lot is lost.

Whats your thoughts on this?

M6 1/4" Dual Battery System Smart Isolator Voltage Sensitive Relay VSR 140A 12V | eBay

**Red90** · 13th December 2021, 10:51 PM

Use the VSR to switch the solenoid.

**d2dave** · 13th December 2021, 11:03 PM

Originally Posted by Red90

Use the VSR to switch the solenoid.

If the VSR works to switch the solenoid it will work to connect the batteries, so using it to switch the solenoid would be pointless.

**Red90** · 14th December 2021, 12:57 AM

The problem is with a small VSR like that you would then need to protect it from over current with a breaker or fuse. The solenoid won’t need that. When the circuits trips, you probably won’t know and you have a less reliable system.

**drivesafe** · 14th December 2021, 01:17 AM

Regardless of what type of isolator is used, you will need a fuse on the positive ( + ) cable, at both batteries, to remove the chance of a short causing a fire.

**PhilipA** · 14th December 2021, 07:23 AM

I have had a solenoid controlling my second battery for about 6 years and no problems on my D2. It is just wired off the ignition on positive .
Regards PhilipA

**d2dave** · 14th December 2021, 08:51 AM

Originally Posted by drivesafe

Regardless of what type of isolator is used, you will need a fuse on the positive ( + ) cable, at both batteries, to remove the chance of a short causing a fire.

Thanks Tim.

I was aware of this as I have the same set up in my D2 with one of your kits and you supplied me with 2x 50 amp circuit breakers, one for each end.

**d2dave** · 14th December 2021, 08:56 AM

Originally Posted by PhilipA

I have had a solenoid controlling my second battery for about 6 years and no problems on my D2. It is just wired off the ignition on positive .
Regards PhilipA

I had my old Rangie wired this way. It worked well until the day I accidentally left my ignition on and had two flat batteries.

This was when I hooked it to the alternator.

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