12v basic relay wiring query

View the thread, titled "12v basic relay wiring query" which is posted in Auto Electrician Forum on Electricians Forums.

Hi all. Totally new to auto relays so hope this is ok to ask.

Can anyone advise would the below work ok for triggering a standard 5-pin changeover relay to allow the blue circuit to be joined when the orange circuit is joined (by the alarm on a vehicle)? pin87a will be unused. This is how I intend to wire it.

The alarm has multiple "circuit" wires eg circuit1, 2, 3 etc to break circuits such as ignition, pumps, etc, and join them when authorised (pin code accepted in vehicle)

(the orange immobiliser circuit puts out 12v)

This means power is on pin85 and ground is on pin86 instead (normally vice versa), but think reverse polarity is ok on this relay anyway?

Thanks
 

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