What's this relay box for?

[Richard n Ann]

I'd have said d+ relays for fridge and battery charging (which is what I'm looking for) but they're all 5a fused and the relays are tiny half inch square things.

2014 Elddis accordo 105

It's in the bodywork pillar behind the drivers seat, the main red+black incoming thick 12v cable is just on a connector to a thick green+white and dissappears under the floor.. No big relays to be seen.

 

[Ditcha]

Do you have central locking?

 

[Richard n Ann]

Do you have central locking?

Yes only on the cab doors though. Doesn't look like a Peugeot part.

 

[Madcaravanner]

Two are lighting (not sure where)
one is central locking
D+ I have no idea

 

[Lenny HB]

looks like the D+ relay to me, most vans they one fit as the D+ terminal of the alternator can't handle the load of all the items that need to be switched in a Motorhome.

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[Ditcha]

It's not central locking then could be the step?

 

[Richard n Ann]

This is inside it the relays look like 5a rated although I can't read the writing

No electric step... There is an auto watch alarm though

 

[Ditcha]

This is in resources section 3 shows the connections in the pillar behind the seat, I know you have a Pug but would imagine them to be the same it might help to figure it out.

Fiat Ducato 2016 Converters’ and Upfitters’ Manual

Very useful guide to detailed mechanical and electrical aspects of converting panel vans and building motorhomes based on the 2016 and later Fiat Ducato chassis. Aimed at the professional converter but full of useful information for the DIY...

www.motorhomefun.co.uk

 

[Wagoneer]

I've got one in my van, located in close proximity to the main 12v distribution box.

It's a CBE SRX250 RELAY FUSE BOX. Mine powers/operates the orange marker lights.

 

[Two on Tour]

On the Elddis vans, it does the switching off of the hab electrics and switching on of the fridge to 12v when it senses the alternator output via the D+.
It's wired across to the BCA PDU and fires relays on the BCA PDU PCB.

Ours failed 3 years ago and had to be replaced.
I carry a spare on the van now as they are a pain to get hold of.

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[Richard n Ann]

On the Elddis vans, it does the switching off of the hab electrics and switching on of the fridge to 12v when it senses the alternator output via the D+.
It's wired across to the BCA PDU and fires relays on the BCA PDU PCB.

Ours failed 3 years ago and had to be replaced.
I carry a spare on the van now as they are a pain to get hold of.

Thanks , how can it handle the 10a fridge supply? Also what's BCA and PDU?

 

[Two on Tour]

how can it handle the 10a fridge supply? Also what's BCA and PDU?

I would imagine you recognise one of these, it's a PDU (power distribution unit) made by BCA and it's a relay in the PDU triggered by the CBE SRX250 relay fuse box that switches the fridge 12v supply when it sees a D+ signal.

 

[GeoffnDee]

It does not handle the supply only the switching of the actual relays that are inside the BCA electrical systems PDU (power distribution system)

 

[Lenny HB]

Thanks , how can it handle the 10a fridge supply? Also what's BCA and PDU?

As I said earlier it takes the load off the D+, it's only distributing the signal to switch other relays for various functions including the fridge.

 

[HUGGY]

Changed one of these recently on our Bailey AA625 2014. Red and amber marker lights had stopped working. Unit is a CBE SRX 250 RELAY FUSE BOX. It controls the marker lights, fridge light and hab central locking and/or electric step if fitted. Got mine from Halesowen Caravan Centre £52 quid including vat and p & p. Prima price was circa £90 quid. All good again now.

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[Two on Tour]

Bought my spare from Halesowen Caravan Centre as well.

 

[Richard n Ann]

If ours goes I'll repair it at that price £2 relay and soldering iron.

 

[Richard n Ann]

The mission is to beef up the B+ wiring so when the fridge is on the charging voltage to the leisure battery doesn't drop to 13v.

Nothing's ever simple is it, I mean how complex can a new piece of wire be
Made a diagram of what I've got, there's connectors, fuses, what look like bodged taped up joints and finally onto a white multi plug on the pcb.

Options.. Put everything back together and forget about it
Or run an additional 25a fused 10mm cable in straight from the +battery to pcb. (probably have to solder it on somewhere as the relays are pcb type)

What does the collective think?

 

[terryway]

It’s the psa bodybuidetsconverstion kit it allow the connection to the main loom

 

[Two on Tour]

The mission is to beef up the B+ wiring so when the fridge is on the charging voltage to the leisure battery doesn't drop to 13v.

Nothing's ever simple is it, I mean how complex can a new piece of wire be
Made a diagram of what I've got, there's connectors, fuses, what look like bodged taped up joints and finally onto a white multi plug on the pcb.

View attachment 562208
Options.. Put everything back together and forget about it
Or run an additional 25a fused 10mm cable in straight from the +battery to pcb. (probably have to solder it on somewhere as the relays are pcb type)

What does the collective think?

I have a schematic of the BCA PCB if you want it Richard.

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[Richard n Ann]

I have a schematic of the BCA PCB if you want it Richard.

Yes please

 

[Two on Tour]

Yes please

On it's way.

 

[Richard n Ann]

Finished fitting an additional 6mm fused cable today. The clamp meter shows the electrons prefer it with 10 amps worth using the new cable and only 3.3 amps on the old original cable. The charge voltage goes up thus...

13.4v before (although it has in the past struggled to get past 13v for some reason) and 13.8v with the new additional cable.

It's about a 2.8m run for the new cable and I soldered it on to the original cable close to the pcb plug and insulated it..

I also fitted a new 6mm ground cable from the starter battery post to the pcb via 2 header pins I soldered in on the ground track.

Used a midi fuse holder and 30 amp fuse

So all in all I'm reasonably pleased with it. Bit of a bodge pcb end but what can you do? As long as it works

 

[Richard n Ann]

13.4v before (although it has in the past struggled to get past 13v for some reason)

Just realised it's probably the new ground cable that's taking it up 0.4v that was connected already.

 

[Richard n Ann]

A 0.8v gain then

Journey home the other week

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