Relay query

[sandancer]

Regarding the leisure battery relay, i saw a thread saying the numbers on the relay are 30 85 86 87, the only relay I have has 30 85 86 87 and 87a, will this make any difference?
What would they 87a be used for
Cheers

[bigherb]

It just means it is a changeover relay. 87a is connected to 30 when the relay is not energized and disconnected when the relay is energised and then 87 is connected to 30, don't connect to 87a if you want to just use it as a normal relay.

[sandancer]

Thank you

[clift_d]

If you're replacing the split charge relay in a Westy then you need a make/break twin terminal relay - it has two 87 terminals but no 87a.
Search on eBay for a Durite 0-727-32.

[California Dreamin]

If you're replacing the split charge relay in a Westy then you need a make/break twin terminal relay - it has two 87 terminals but no 87a.
Search on eBay for a Durite 0-727-32.

Close but not correct....the relay you actually need (on a Westfalia) does not have the two outputs (87,87 on the relay pic) connected.
Often referred to as a 'Double make and break' and recognisable by being designated with 87 and 87b output terminals (not 87a) subtley the output terminals are NOT connected at 'rest' (un-energised)

You need a relay that looks like this: admittedly, quite difficult to find and if it needs replacing anyway I suggest upgrading to a Lucas/Durite SRB630 (60amps instead of 30amps handling)



http://www.autoelectricsupplies.co.uk/p ... ategory/36" onclick="window.open(this.href);return false;


The Lucas/Durite upgrade alternative (can handle double the power of the original relay and requires just four new terminals fitting) All importantly. it has output terminals that are not connected when the relay is resting (not energised) ... as per original Westy relay.

Link here:
http://www.autoelectricsupplies.co.uk/p ... tegory/149" onclick="window.open(this.href);return false;




Martin

[clift_d]

Hmm. The Westy circuit diagram I have shows a relay with connected '87' tabs that have the BBB and main vehicle electrics attached, with the leisure battery on 30. The principle is the same as you describe i.e. the leisure battery only gets connected to the vehicle electrics when the engine is running, but the configuration is different.

[nicq]

Relay with 87a is a changeover relay see http://www.mobileinformationlabs.com/Ho ... _Intro.htm" onclick="window.open(this.href);return false;

[California Dreamin]

I should have a searched for an old post of mine from a couple of years back where it went in to this...all I know is the outputs needed to be kept separate on the particular diagram I was looking at to prevent the battery flattening, I can't remember the exact details (12 volt fridge perhaps?) something like that...perhaps its not the same on all but I do know Westfalia fitted a double make and break relay to prevent this happening.
Unfortunately, I haven't got the benefit of the wiring diagram in front of me to check to see why.


Martin

[clift_d]

Hmm. The Westy circuit diagram I have shows a relay with connected '87' tabs that have the BBB and main vehicle electrics attached, with the leisure battery on 30. The principle is the same as you describe i.e. the leisure battery only gets connected to the vehicle electrics when the engine is running, but the configuration is different.

Okay. I've checked again and it appears that the circuit diagram I have (courtesy of westfaliat3.info) does show a relay as I'd described for the 1985 Joker / Club Joker. Whether it was the same relay or wiring configuration on earlier or later Westys I couldn't say - the circuit diagram is the last page of the linked PDF below.

http://www.westfaliat3.info/1985JokerMa ... 211010.pdf

E D I T
Here's an excerpt from the circuit diagram showing the split charge relay (C1) in the centre. The labels are a bit hard to read (that's down to the original file I'm afraid) but the relay type is clear.



A - 12V Secondary battery, driver's seat box
A1 - Battery charger, bench seat
B - Connection to the switch box, VW schematic
C1 - Secondary battery isolation relay, driver's seat box