How to wire extra hazard lights only (not indicators)?? Help

[Tran59]

I would like to add two extra flashing lights at the top of my rear windows which flash only when the hazard warning lights are on. The problem is that I don't want them to flash when I use the indicators to turn, as they are 'emergency' strobe-type flashers.

Does anyone know if it's possible to tap into the rear indicators and/or hazard warning light switch so that the strobe lights only come on when all the indicators are flashing?

TIA

[ake]

Given the complex nature of the Can bus wiring on the MK7, it would be far easier just to use a seperate switch, avoiding the need to make an embarrassing warranty claim for a blown up BCM

[ireland.1495]

easier just to use a seperate switch & flash relay

[trigger]

I would think you would have to run a wire and tap into the hazard relay as you cannot tap into the lights themselves as they would flash with the indicators

[ake]

I would think you would have to run a wire and tap into the hazard relay as you cannot tap into the lights themselves as they would flash with the indicators

Not on a MK 7 you can't there is no hazard relay, its all done by the BCM

You would struggle to do this on a MK5 or 6 as the hazards and the indicators share a relay, I'm not saying it cant be done but it would require quite a bit of knowledge and a few relays

Like I said earlier a seperate switch is the easiest way, Also what about lighting regulations? Would having additional lights switched with the hazerds comply with all regs

[ireland.1495]

easier just to use a seperate switch & flash relay

12v bike flash relay & switch
did it a few times easy like extra spots

something like this
eBay item:
LIN12 Universal 6,12 Volt Indicator Flasher Flash Relay (#220472211469)

[AlanN]

Why not just use a relay off the supply to the hazard flasher bulb on the dash!!!, vertually no current from the relay.

[captain hook]

I'm guessing you've never played with Can-bus or BCM modules before

Leave it alone....Seperate switch is the way forward

[MrMPuk]

Not sure what the French vehicle inspections are like but this would mean an MOT failure in the UK as well if they were wired into the hazard circuit.

[trigger]

You mean they have Transits in France? i thought they all drove Renault Traffics

[AlanN]

Yes I have... but not on a transit, whats the problem with them Barry

OK then, photo electric switch, not sure where you could hide that in the button thou

[ake]

The strobe lights would require a constant 12v supply, not one that flashes on and off

[Tran59]

Many thanks for your words of wisdom, everyone. I think all things considered, I will play safe and go for the separate circuit controlled by a switch.