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What type relay

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hobbit:
Ok here's oen for you sparky's

Trying to wire a recover light beacon in at the mo, no probs, but
needs powering on one switch, but the unit has 2 circuits to run, one full power to run with the engine running, and a low power circuit for when the engine is off

I know it needs an auto switching relay but cant think of the type, one that will automatically switch the power from a charging circuit(high powered) to battery (low powered)

and also be able to be turned off on one overall switch

Just cant get my head round this at the mo

Hope this makes sense :?

ChrisW:
Is it two circuits in the light bar or one?

Engine running - circuit one on / circuit two off
Engine off - circuit one off / circuit two on

OR

Engine running - circuit on supplied from alternator
Engine off - circuit on supplied from standby battery

Hissy:
Lights, Switches, Relays Mmmmm  :shock:  :shock:  :shock:
Now that sounds complicated  :?  :?  :?  :?
You'll be needing an electrician then  :wink:  :wink:  :wink:

hobbit:

--- Quote from: "ChrisW" ---Is it two circuits in the light bar or one?

Engine running - circuit one on / circuit two off
Engine off - circuit one off / circuit two on


--- End quote ---


Yes Chris

This one, the bar has two feeds in

Elmo:
If I'm understanding your requirement properly, you need a 5 blade switchover relay.

Vehicle wiring products do them for £3.13 +VAT +postage which can handle 20 amps, if you need more they are probably available but I can't give you a link.

http://www.vehicle-wiring-products.co.uk/VWPweb2000/relays/relays.html

Piccy attached.

Basically attach one circuit to the 87 output, another to 87A.

Force the relay to switch on engine running by firing it from the alternator warning light feed to the dash.

You'll need an override switch as in this scenario the "engine off" feed will run regardless i.e. always.

best guess as to actual connections (without seeing bar or car :) ):

Battery - fuse - override switch - terminal 30
Output to beacons (low) - 87A
Output to beacons (high) - 87
Alternator sense (tap from alternator brown/yellow wire or intercept under dashboard/column) - 85
Earth - 86

Hope this is (a) right and (b) helps

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