No switched 12v supply help

[Andyjc86]

I've just finished wiring a hands free kit into a car that has no switched 12v supply (uses 5v canbus).

What I need is a switch or relay that turns on at about 13v and off below that. Is their anything out there?

Thanks

[shoehorn]

Knowing what car it was would help and there will certainly be a switched 12v feed on the car somewhere.

[Andyjc86]

2005 passat, and before you say it, the cig lighter is constant 12v

[Mr Happy]

Any of the mini-blade fuses on the LHS of the dash should be switched 12v. Use a piggy back fuse to tap it like this: http://www.ebay.co.uk/itm/Add-A-Circuit-Standard-M...

Check with a meter to confirm first, obvs.

[ging84]

i can guarantee you there is at least 1 12v on ignition wire coming out of your fuse box which you can tap into

[Andyjc86]

Mr Happy said:

Any of the mini-blade fuses on the LHS of the dash should be switched 12v. Use a piggy back fuse to tap it like this: http://www.ebay.co.uk/itm/Add-A-Circuit-Standard-M...

Check with a meter to confirm first, obvs.

Sweet, I've never seen them before thanks.

I've found the switched lives in the box, I just didn't fancy removing it and chopping into the wiring. Thanks

[TooMany2cvs]

Andyjc86 said:

and before you say it, the cig lighter is constant 12v

So use the 5v switched to trigger a relay and switch 12v from the ciggy lighter.

[Mr Happy]

TooMany2cvs said:

Andyjc86 said:

and before you say it, the cig lighter is constant 12v

So use the 5v switched to trigger a relay and switch 12v from the ciggy lighter.

The can wiring isn't really suitable for this as it's a data bus, it's not a '5v switched live' so to speak.

The piggy back is the easiest way, followed by spading a blank in the fusebox (ghetto), followed by splicing into a wire behind the dash (with the associated potential for problems).

[PhilTD5]

The traction control switch (if it has one) has an ignition switched 12v feed. Ive seen hands free kits wired to that on VW caddy vans