Removing starter battery from vehicle fitted with Sigma S30 security

[Lizbiebrowne]

Following some recent starting difficulties on my Hymer B654 I want to remove the starter battery and clean up the various connections and fuses to the positive side and the earthing system connected to the negative side. However, I have a Sigma S30 security system fitted and I’m a little nervous with how it will react to being without power for possible a few days - should I be?

 

[BouncyBoatFolk]

Connect an auxiliary supply to the jump/charging terminals under the bonnet.Most people do this when swapping out the battery as well.
Mike.

 

[daveclare]

If you do this, remember your positive battery connection cable will be live. So be careful where your place it after removing it from the battery.

 

[Lizbiebrowne]

Connect an auxiliary supply to the jump/charging terminals under the bonnet.Most people do this when swapping out the battery as well.
Mike.

If you do this, remember your positive battery connection cable will be live. So be careful where your place it after removing it from the battery.

Yes, I’d thought about doing that but I wanted to dismantle and clean up the fuses on the positive side (partly so I can understand what’s going on there) and it looks a bit complicated to find which one I should attach to an auxiliary battery to and how I’d do it.

 

[Figaro]

I've disconnected my Sigma alarm from power previously when changing the cab battery, never had a problem

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[BouncyBoatFolk]

Yes, I’d thought about doing that but I wanted to dismantle and clean up the fuses on the positive side (partly so I can understand what’s going on there) and it looks a bit complicated to find which one I should attach to an auxiliary battery to and how I’d do it.



View attachment 986604

The connection points are under the bonnet, Earth bolt in the centre upper bay, +Pos. Plate, to the right of air filter bin [ Fiat ]. AS MENTIONED THOUGH , the cable to the cab battery will still be live,so don't plonk it down on anything metallic, place a rubber mat down to work on possibly. See post above though.
Mike.

 

[Lizbiebrowne]

The connection points are under the bonnet, Earth bolt in the centre upper bay, +Pos. Plate, to the right of air filter bin [ Fiat ]. AS MENTIONED THOUGH , the cable to the cab battery will still be live,so don't plonk it down on anything metallic, place a rubber mat down to work on possibly. See post above though.
Mike.

Yes. it's a Fiat. Thanks for the guidance, I'll take care with the +ve ends.

 

[GeoffnDee]

Yes, I’d thought about doing that but I wanted to dismantle and clean up the fuses on the positive side (partly so I can understand what’s going on there) and it looks a bit complicated to find which one I should attach to an auxiliary battery to and how I’d do it.



View attachment 986604

You will be disconnecting the sigma alarm anyway from the starter battery when you remove/clean the fuses on the battery plate , depending on which one is being used for the alarm circuit , so adding another power supply to the battery connection via the jump start point will not help (unless you know which fuse is the supply to the alarm, and also connect the extra power supply to it) .
As Figaro has said , it must be possible to change the battery without problems , so If you do not have the alarm manual , Sigma may be able to advise you if you contact them .

 

[Lizbiebrowne]

Thanks. I have the manual but I can't find any mention of removing the battery. I called the engineer who fitted the system (for the previous owner) whose advice was that there shouldn't be a problem so long as the system was disarmed prior to removing the battery. But I have seen examples of people having trouble (on the internet) so I was looking for reassurance from others on here.

 

[autorouter]

Yes, I’d thought about doing that but I wanted to dismantle and clean up the fuses on the positive side (partly so I can understand what’s going on there) and it looks a bit complicated to find which one I should attach to an auxiliary battery to and how I’d do it.

I posted a short description of the positive battery terminal distribution block recently, may be of interest (post #5):

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There is a shaped piece of metal attached to the battery terminal, and one end of all the link fuses is attached to that. There are other bolts in that piece of metal, to attach wires without fuses. Presumably there will be inline fuses in those wires, very near the battery terminal.

I can see that on your distribution block, there are wires attached to the fuse bolts on the battery terminal side, ie before the fuse, not after it. Ideally those wires should have been attached to one of the several free bolts on the shaped piece of metal. But attaching them to the battery end of a fuse is OK electrically, it just might be a bit confusing if you're trying to work out what powers what. Just check that there is indeed a fuse on each wire that is attached in this way.

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