Accessing IG2 circuit for split charge relay

[paulim]

Hi, First post so please be gentle!

I'm currently struggling through fitting a leisure battery into my Freda (the forum and you tube have been very helpful so far so thanks!). I've kicked it off and the next job is to connect the relay trigger circuit to the IG2 circuit but due to inexperience I'm not sure how to go about doing that in the practical sense. I've got the fuse box out and picked out the blue / white cable and the green cable behind the 10A fuse, but there is so little slack there it looks difficult to get in there without damaging existing wires. Does anyone have any advice on how to do this? Where, what connectors work best? Once I've got the charging sorted I'm planning to tap into the fuse box for the lights, 12v sockets etc.

Hopeful thanks in advance,
Pauli

[rita]

You could use a VSR....voltage sensing relay.

This might help....


http://www.instructables.com/id/Fitting ... zda-Bongo/

http://cdn.instructables.com/F9D/7EVT/F ... .LARGE.jpg

[paulim]

You could use a VSR....voltage sensing relay.

This might help....


http://www.instructables.com/id/Fitting ... zda-Bongo/

http://cdn.instructables.com/F9D/7EVT/F ... .LARGE.jpg

Thanks, but got the 100A relay already with cables / fuses made up for the batteries, just need to know the best way to get into the IG2 circuit. Now I'm here, I kinda want to finish it - bit bloody minded like that!

[teenmal]

You can pick it up at the IGN SW.

[paulim]

Sorry, lost me - IGN-SW?

[teenmal]

Sorry, lost me - IGN-SW?

Ignition Switch.

[paulim]

How do I get there?

[teenmal]

How do I get there?

Remove the cowl/covers and all will be revealed you are looking for the bit you insert the Ignition key to start the vehicle.

Good Luck.

http://lushprojects.com/bongopartsmk2/c ... mgno=.html

[paulim]

Ok, thanks, I'll have a look. I was under the impression that it's possible to access the IG2 circuit from behind the fuse box without having to disassemble the steering column!

[Simon Jones]

If you just need a switched supply to power the relay, then you could take a feed from the supply side of one of the switched fuses. The disadvantage of using a basic relay setup like this is that you don't give the alternator a chance to get any juice into the starter battery before adding the load of the leisure battery. If the LB is heavily discharged, then as soon as you turn the ignition on, you are adding a massive load across the starter battery which may result in difficulty in starting. A voltage sensing relay (VSR) won't connect the LB until the starter battery reaches a certain level.

[g8dhe]

There are Pro's and Con's, but for me having control of the relay is a bonus. You can pick up a fused IG2 circuit from the lower connector of this fuse;


The bonus being that you can charge the S/B from the L/B should you ever have a flat S/B by simply turning the Ignition to ON for 10-20 minutes!

[paulim]

There are Pro's and Con's, but for me having control of the relay is a bonus. You can pick up a fused IG2 circuit from the lower connector of this fuse;

Thanks Geoff, I think I'd picked that up from some of your wisdom on another thread. My question really is how do I do that?

Do I take the fuse out and put a male spade connector in there instead, wired to the relay? What happens to the fuse?

Or do I cut the wire at the back and put extra connectors in to allow access to the circuit? It all looked a bit tight for that.

It's the spoon-feeding advice I'm after I'm afraid, and any photos would really help.

Many thanks,
Pauli

[Gasy]

Piggy back fuse
I know what you mean mate
Them cables at back are real tight together
I think You could use a piggy back fuse remember its a mini blade piggy back fuse
Eblag item number 321088780930

[paulim]

That looks like a great little bit of kit, thanks - avoids all the shenanigans round the back.

[g8dhe]

Piggy back fuses are really nice for that sort of job! Getting to work on the back of the fuse box is quite possible but it is quite a confined working area for whatever method you use.