dual battery switch

[MaTTe]

Cheers Shane, i'll look into things further
much appreciated for your continued efforts

[rossie]

That solanoid looks like the one used on ford v8's starters with the external solanoid (clacker)

[Mark B]

Howdy 

When I put my new Bosch starter in, it wouldn't crank when it got too hot (it's right next to the extractors, so get's hot often). The answer here (MaTTe) is a starter relay - it never fails and is a very strong crank 

Thought I would chuck up a quick diagram of how my dual battery/starter system is wired, including the starter relay, incase anyone needs to incorporate a starter relay into their setup or can benifit from another way to use the solenoid.

Hope it helps someone.

Cheers!

[MaTTe]

Hey Mark, i used to have a 620cca battery in the van, but when the immobiliser ran the battery down as it sat for so long, the battery dropped a cell. That battery never had any troubles starting the van on a 40degree day when hot. But that being said, a relay is actually a great idea.
I might look into incorperating a relay in there as well.
What sort of circuit breaker are you using?

cheers,
Matte

[Mark B]

Howdy MaTTe man =)
Yes the relay works great - I am really happy with it. It took ages for me to figure out why it randomly wasn't cranking over. Then i figured out it only happened when i had been driving for a while and went to start it while it was warm. Then it clicked. I just grabbed the highest rated circuit breaker from Autobarn that I could get my hands on. You could also use a fuse if you wanted to, but the CB just short circuts instead of blowing ..handy

[MaTTe]

cheers Mark, thats great to hear.
Are you using a relay similar to the type Shane posted for both the starter and the battery isolation? Or are you using some kind of high rated little black bosch or similar?

[Mark B]

Hey mate,

I am using a similar solenoid (that Shane posted) for the battery isolation only. And am using a standard 12v relay (30A - i think) for the starter relay. It's like this one:

I just split the wire (with terminals into Y shape) coming from ignition , one end goes to the soleniod and one to the starter relay.
Hopefully that makes sense. Have another look at my diagram if it doesn't. Let  me know how you go =)

[MaTTe]

Hey Mark, thats great, cheers.
I had thought by your diagram that it was a relay similar to that, however i wouldn't have thought a 30A relay was upto the task, but there you go.

I'll save all of this info, and have a go at fitting this all up over the next couple of weeks

Cheers for all of your help fellas!
Regards,
Matte

[ben]

sorry boys but if you look in the photo it says 100A?

how much that one set you back mark b?

ben

[Mark B]

Howdy lads, that picture is one that I chucked up as an example of the type of relay I used.

My one is actually a 35A one - a standard on that u use on either an air horn or driving lights etc.

I had it lying round, so not sure how much..they're not expensive tho