Jump starting using dual battery question

Submitted: Friday, Mar 18, 2011 at 13:02

ThreadID: 85073 Views:16611 Replies:6 FollowUps:7

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Member - Richard C (ACT)

Hi,

A bit of a dumb question sorry.

I was just wandering if it would be safe to jump start the car using the dual battery.

Should I remove the dual battery first or what ?

I believe some isolators have these capabilities built in but not sure if mine has.

Richard

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Reply By: David B (wa) - Friday, Mar 18, 2011 at 13:06

Friday, Mar 18, 2011 at 13:06

What sort of isolator do you have on the vehicle

AnswerID: 448556

Follow Up By: Member - Richard C (ACT) - Friday, Mar 18, 2011 at 13:22

Friday, Mar 18, 2011 at 13:22

I have It is a REDARC SB112

Richard

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Follow Up By: David B (wa) - Friday, Mar 18, 2011 at 13:53

Friday, Mar 18, 2011 at 13:53

With the REDARC all you do is connect the 2 terminals together with a temporary wire, start the car then remove the wire ASAP
The other way is to install a momentay switch on your dashboard then you can do this from the drivers seat
make sure you use a swith and wire that can handle the current or you may melt it all

If you are unsure visit the rearc web site i think they have all the specs you need to do the job

Dave

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Follow Up By: Member - Richard C (ACT) - Friday, Mar 18, 2011 at 14:01

Friday, Mar 18, 2011 at 14:01

Dave,
Thanks for that.

I have had a look and I certainly don't have is set up to do but wiill further to do

Richard

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Follow Up By: Snoopyone - Friday, Mar 18, 2011 at 14:53

Friday, Mar 18, 2011 at 14:53

You dont need heavy wires for the momentary switch as it only pulls the contacts in same as in a relay.

I have a relay that is connected to the switch wire that automatically does that every time the car starts. No big wires there either.

FollowupID: 720812

Follow Up By: Mick O - Friday, Mar 18, 2011 at 14:55

Friday, Mar 18, 2011 at 14:55

Richard,

heres a wiring diagram for what you wish to do from the Redarc site.

Ultimate Dual Battery set-up

Cheers Mick

''We knew from the experience of well-known travelers that the
trip would doubtless be attended with much hardship.''
Richard Maurice - 1903

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Reply By: Allan B (Sunshine Coast) - Friday, Mar 18, 2011 at 15:00

Friday, Mar 18, 2011 at 15:00

Richard, Jump-starting through your Redarc isolator can be dodgy unless it has been installed with sufficiently heavy cables and you know what you are doing. I know the technique is offered in the Redarc instructions and that others do it, but......?

I DO know what I am doing and my cables ARE starter sized, but I still would rather not put starter current through my Redarc solenoid.

Seems to me that jump-starting should be a rare event anyway and it is hardly much trouble to simply use jump-cables from battery to battery as you would normally do. If you want to be extra careful, disconnect the existing negative terminal from the auxiliary battery before connecting the jump-cables, but the battery can remain in the vehicle.

Having the Redarc set up for jump-starting does NOT dispense with the need to carry jump-leads. You never know when you may need to jump-start from or to another vehicle.

Cheers
Allan

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AnswerID: 448565

Reply By: Member - Richard C (ACT) - Friday, Mar 18, 2011 at 15:46

Friday, Mar 18, 2011 at 15:46

Hi,
Thanks all for great info.

I noticed that in my set up there are blue wires coming fcrom the isolator but I have no switch inside to turn it on - is it automatic?

Also thanks Alan re jumper cable - that is the direction I was planning as was not sure about the other stuff which would be great if it is there.

Richard

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Follow Up By: Allan B (Sunshine Coast) - Friday, Mar 18, 2011 at 16:31

Friday, Mar 18, 2011 at 16:31

Richard, The Blue wire should be connected to the input positive (same as the Red wire) as per this Wiring Diagram on the Redarc website. The Orange wire should be connected to suit the Aux battery type according to the instruction also on the Redarc website.

Cheers
Allan

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Follow Up By: Member - Richard C (ACT) - Saturday, Mar 19, 2011 at 01:23

Saturday, Mar 19, 2011 at 01:23

I will check out - many thanks

RIchard

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Reply By: Member -Dodger - Saturday, Mar 19, 2011 at 15:47

Saturday, Mar 19, 2011 at 15:47

If you have jumper leads then just connect the two battery\s together via the positive terminals wait a minute for the fuel pump if electric to preassurize the fuel line glow the vehicle up and away you go then as soon as the engine idles disconnect the aux batt first then the main from the jumperlead.
The negative terminals of both batteries are usually both grounded to the chasis somewhere.

I used to have a handle on life, but it broke.

Cheers Dodg.

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AnswerID: 448658

Reply By: bks - Saturday, Mar 19, 2011 at 21:56

Saturday, Mar 19, 2011 at 21:56

My starter battery failed the other night so I simply used jumper leads from the dual battery to the starter battery. It kicked over no problems.

Next day when I had a new starter battery installed, I had the auto election check that it had not caused any problems and fortunately every thing was OK.

AnswerID: 448675