Split charge relay identification

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Split charge relay identification

Post by Portafold on Thu Jun 29, 2017 4:33 pm

Hello, I've got a 1990 AutoSleeper (Legend GL) based on a pre-smilie Mk3 Transit, but I can't identify what some of the under-bonnet relays are for.

I'm trying to find the split-charge relay (which is not working) and I've been told it's on the bulkhead, so I'm trying to identify all the bulkhead items so I can fix things in the future.

The off-side bulkhead has two relays with built-in fuses, but what are they for?  (The fuses are ok by the way)







Thanks in advance.

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Re: Split charge relay identification

Post by Peter Brown on Fri Jun 30, 2017 5:21 am

There are no relays fitted to the bases and from your other posts it looks as though the leisure wiring has been refreshed and maybe altered. The leisure battery + terminal is badly corroded.

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Re: Split charge relay identification

Post by Portafold on Fri Jun 30, 2017 11:25 am

When you say 'fitted to the base' what do you mean?

Yes it's furred up but it took precisely 2 weeks to get like that.  I think it's the battery (Towsure), it always furrs up not matter what I do.  I've tried copper grease, vaseline, dry, felt pads, cooper coins, and it always furrs up the positive terminal for some reason.

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Re: Split charge relay identification

Post by Peter Brown on Fri Jun 30, 2017 11:29 am

The two units with fuses are also bases for relays

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Re: Split charge relay identification

Post by Portafold on Fri Jun 30, 2017 11:51 am

The two units (with the fuses) on the o/s bulkhead are relays, aren't they?

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Re: Split charge relay identification

Post by -mojo- on Fri Jun 30, 2017 11:56 am

Visually, they look like bases without relays, but if you look at the connectors - which protrude from the bottom - you see that they are not. They seem to be relays without additional bases, with wiring connected directly onto the terminals. The type with a fuse built-in is still readily available, though I personally have never used one.

As Peter says, it looks as though a previous owner has had the wiring re-done, so it's not likely that anyone here will recognise which relay does what from its appearance. Given that, the best way IMO to find out what each relay does is - having first checked that all the electrical appliances work - to disconnect each in turn and see what stops working.
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Re: Split charge relay identification

Post by Portafold on Fri Jun 30, 2017 12:29 pm

-mojo- wrote:Given that, the best way IMO to find out what each relay does is - having first checked that all the electrical appliances work - to disconnect each in turn and see what stops working.

Yeah I think that's the only option left to me to be honest.

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Re: Split charge relay identification

Post by Alf on Fri Jun 30, 2017 2:39 pm

The easy way to do this is ....

Run the engine check that the fridge is working on 12v then remove a fuse from 1 relay check the fridge when you find the fuse that turns the fridge off,    the other relay is the split charge relay. you can only check this with the engine running.

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Re: Split charge relay identification

Post by Portafold on Fri Jun 30, 2017 3:01 pm

Alf wrote:The easy way to do this is ....

Run the engine check that the fridge is working on 12v then remove a fuse from 1 relay check the fridge when you find the fuse that turns the fridge off,    the other relay is the split charge relay. you can only check this with the engine running.

Alf

Something I've always wondered, does the fridge '12 volt' switch light up when the fridge is working on 12 volt?  I've never been in the back of the van when the engine's running to find out.  Dometic RM4211 by the way.

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Re: Split charge relay identification

Post by Alf on Fri Jun 30, 2017 3:21 pm

Yes it should only work when the engine running ...as the other relay the split charge one does this normally turns the lights off when the engine is running 

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