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Aux battery fridge relay wiring

Hi, I have a Halfords "auxiliary battery and fridge supply" wired relay(No.

473553)that I am wanting to fit to my car / caravan. I bought it several years ago but have lost the fitting instructions.

The relay has the numbers 1 to 6 along the top of the case but only 5 wires coming out at the bottom:

Starting under the number 1 they are:

Thin purple, medium length Thick red, long length Thick green, short length, with 15A inline fuse Thin black, short length Thick green, long length

If anyone has an idiot's guide to installing this unit I would be very thankful for a copy.

Regards

Mel Sharpe

Reply to
Mel
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One day Mel got dressed and committed to text

From that info I would guess that the coil wires are the purple and black, the supply to the 'center' of the changeover contacts will be the green. Start off by connecting the black and purple wires to 12v and listen for a 'click'. If that goes well then connect the green to the plus on the battery and see which of the other wires is energised when the relay is 'on'. You could verify the coil wires with an ohmeter (measure the resistance across the black and purple), could be anything from a few hundred ohms to a few thousand ohms. Similarly the main contacts.

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Regards ..... Rheilly Phoull
Reply to
Rheilly Phoull

It's a relay with SPDT contacts, at a guess.

The two thin wires will be the relay coil. I'd guess the green with the fuse will be common, but to be certain you'll need some form of continuity tester like an ohm meter and check which two contacts are made with the coil off and energised.

How is it meant to work? Does it simply run the fridge off the car battery with the engine running, and revert automatically to the caravan battery when it isn't?

Sorry not to know, but I'm not a caravan person. ;-)

If so, I'd guess the green with fuse goes to the fridge, thick red to car battery, and thick green to caravan one. But that's only the way I'd make the colours - to be certain you'll need to test first.

The thin black to ground, and the thin purple to an ignition controlled supply.

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*How much deeper would the oceans be without sponges? *

    Dave Plowman        dave@davenoise.co.uk           London SW
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Dave Plowman (News)

might be a better bet.

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*When a clock is hungry it goes back four seconds.*

    Dave Plowman        dave@davenoise.co.uk           London SW
                  To e-mail, change noise into sound.
Reply to
Dave Plowman (News)

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