I've bought a hazard rocker switch from CBS (ordered yesterday arrived already this morning!) but I'm not sure how to wire it in. It has 2 connectors at the bottom which are closed when off and open when on. It has 4 connectors at the top which are open when off and closed when on.

The relay has a 12V in, a ground and a flash out which goes to the direction switch and the LED indicators.

The 4 connectors I guess are wired to the lights and to the output of the relay but I don't know how to switch permanent 12V to the relay with the other contacts. What do you suggest?

Going to guess it came without a wiring diagram, that doesn't sound like them, suggest you call them and get them to email it to you, simplest way I would have thought

The LED flasher doesn't tick so I assume it is solid state. I'm guessing it is low current then. Is there a problem with leaving it connected to permanent live? The hazards will work when the ignition is off, but so will the indicators. Will the MSVA inspector mind.

The other trick, as I'm using the bike loom, is that it has an "off" switch. I could wire the flasher to this power source, which will be on for the MSVA test and off when left in the garage. Is this a reasonable idea?

I still don't get why a contact which is on when the hazard switch is off could be useful.

The "on" contact when your switch is off is the ignition supply to the flasher relay. The hazard switch should swap the flasher relay's supply from an ignition to a permanent live feed when you operate it. You should not have indicators fed by a permanent live.

Cheers R

Any good?
http://www.autoelectricsupplies.co.uk/file_uploads/081904_wiring_diagram.jpg

or...
http://www.autoelectricsupplies.co.uk/file_uploads/081223_wiring_diagram_1.jpg

The first one would be right if my switch had 7 terminals. It is the lack of the 7th that is giving me the problem.

Switching off the ignition feed when the hazards are on is great so long as you also switch on a permanent feed. CBS' switch doesn't do this.

Which switch did you buy?

quote:

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Originally posted by rachaeljf
Which switch did you buy?

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Hmm, I bought the exact same switch yonks ago for a project, but it's languished in a box since I got it. It seems this switch is intended for an "add on" hazard circuit, using an additional flasher relay similar to the hazard switch+relay kit that CBS also do.

You can wire it as per the CBS kit with an additional hazards-only flasher relay, or wire it so that the bottom two terminals switch a changeover relay, which then switches your existing flasher relay's + or 49 terminal between permanent and ignition feeds (connect terminal 87 to the permanent live, 87a to ignition live, 30 connected to 49 on the flasher).

A third method would be to use a decent high current diode in the ignition feed to your flasher relay. Then the hazard switch can provide a permanent live to a piggybacked connection to the + or 49 terminal of your flasher relay, keeping the diode ignition live connection to the + or 49 terminal. The diode prevents unintentional powering up of your ignition and everything else that's ignition-fed, when you switch on your hazards.

In all cases, the top four terminals connect to 1)O/S indicator lights, 2)N/S indicator lights, 3)Hazard warning light and 4)The existing flasher L or 49a terminal.

Phew, hope that all makes sense.

Cheers R

The diode idea makes sense. I'll probably do it that way. Cheers.