I have just rewired my 1973 bay window - when I connect the blue/red wire between the dashboard and flasher relay, the dashboard indicator lights flash and I can here the relay, despite not indicating or using the hazard button?!?! The bus is on and there are no external indicator lights working. When I disconnect the blue / red wire the indicators and hazard switch work as they should (but obviously no dashboard lights). Has anyone encountered this issue before? Cheers
If the relay starts clicking, the load from just the dashboard indicator lamp is enough to trigger it. If you then indicate, do the indicators work OK? Do the hazards work with the key in both the off and run position, or only in the run position ? Does the oil pressure light work when you turn the key on without starting the engine? (probably does) I suspect there is a mistake on the relay power feed wiring from on the hazard switch - you have swapped the wires on the switch - connections 30 (red wire should go there) and 15 (green wire should go there) so that the relay is permanently powered when the hazard switch is in - so the dashboard indicator light can present a load and cause the relay to click. With the power swap, and the switch in the indicators probably work without the ignition being on.. Then with the power swap and the switch in the hazard position, you also would need the ignition power on to make the hazards work. It might blow the indicator fuse 11 because the load is greater than expected and the fuse is ancient (84W or 7 amps) And the + terminal of the relay (white wire) should come off the + output of the hazard switch. Hazards should work regardless of ignition power being on , so you can take the key out, lock up and leave the vehicle with the hazards on.
Hi, thanks for your help - the relay has 3 terminals 49 (is this the same as +?) it has a white wire to the hazard switch + terminal. 31 with brown to earth and 49a with the blue wire to indicator lights and the wire to the dashboard lights. is the correct - it seems to be?
Maybe I need to check the hazard switch wiring (terminals L, R +, 15, 30, 49a and a terminal on the side)?
49 will be the + wire of the relay. I think the relay wiring is correct. If you get the relay wiring wrong it wont click at all or it will be possibly damaged. Yes, as I said, I think the mistake is in the hazard switch wiring.. I think the easiest way to produce the symptoms you describe is to swap the wires on 15 and 30 of the hazard switch. Two modes when its wired correctly. 1.Hazards off. Relay power from fused ignition supply 15 to the relay + . Output of relay goes to centre contact of indicators. Moving the indicator stalk connects centre contact to left or right indicator lamps. Dash indicator comes on when external lamps are off. 2. Hazards on. Relay power from permanent hot wire 30 to the relay +. Output of relay is connected to both left and right indicator lamp circuits by the switch, and to the bulb in the knob of the hazard switch. As an additional check of wiring .. At the same time: If the ignition is off, dash indicator lamp comes on (in step with the knob lamp) when external lamps are on. If the ignition is on dash indicator lamp comes on when external lamps are off. (exactly the opposite of the switch knob lamp).
Thanks Mike - It'll be next weekend before I give it ago again (and hopefully the weather will be a little warmer!) Have a good week!
Hi Mike, swapped the 15 and 30 on the switch and get exactly the same symptoms.......I'm at a loss.......
You need to write down what happens 1. Ignition off , hazards off, indicators central. Left indicators do what? Right indicators do what? Dash light does what ? Hazard flasher knob does what ? In step with dash light ? 2. Ignition off, hazards on. Left indicators do what? Right indicators do what? Dash light does what ? Hazard flasher knob does what ? In step with dash light ? 3. Ignition on, hazards on. Left indicators do what? Right indicators do what? Dash light does what ? Hazard flasher knob does what ? In step with dash light ? 4 Ignition on, hazards off, indicate left or right.. Left indicators do what? Right indicators do what? Dash light does what ? Hazard flasher knob does what ? In step with dash light ? Basically go through all the switch positions and see what happens. This will point at wiring errors and possibly simply a collapsed hazard switch or similar. The circuits are confusing but in each case there is an intentional current path which should exist when the switches are in a particular position. The hazard switch has the job of selecting where the power comes from for the flasher relay - ignition when the switch is off. Permanent 12 volts.when the switch is on.. And the other thing the hazard switch does is short out the directional switch for the indicators so it connects the flasher to both sides regardless of the position of the directional switch. If the relay starts clicking - if its OG it needs 42 watts of load to flash once per second, and 21 watts to flash twice a second (bulb fault front or rear) Or if its a modern LED compatible flasher, it will start up clicking once per second with the hazards switch pulled out, with just the load of the 1.2 watt dashboard lamp if the positive feed to the relay is at 12 volts.. Underneath all your problems.. with the ignition Off and the hazard switch pushed in there should be no power on the flasher relay so it should not be clicking..
Ok gents (and ladies), I've done some testing as discussed: 1. Ignition off , hazards off, indicators central. Left indicators do what? Nothing Right indicators do what? Nothing Dash light does what ? Nothing Hazard flasher knob does what ?Nothing In step with dash light ? Nothing 2. Ignition off, hazards on. Left indicators do what? ON Right indicators do what? ON Dash light does what ? ON Hazard flasher knob does what ? Nothing In step with dash light ? Yes 3. Ignition on, hazards on. As soon as ignition on, the dash flashes and relay clicks (without hazard switch / using indicators) Left indicators do what? ON Right indicators do what? ON Dash light does what ? ON Hazard flasher knob does what ? Nothing In step with dash light ? Yes 4 Ignition on, hazards off, indicate left or right..As soon as ignition on, the dash flashes and relay clicks (without hazard switch / using indicators) Left indicators do what? ON (with left signal only) Right indicators do what? ON (with right signal only) Dash light does what ? ON Hazard flasher knob does what ? Nothing In step with dash light ? Yes Does this help diagnose the issue? Thanks
The circle with a cross in it is the green dashboard lamp. Arrangement 1. Indicators. Arrangement 2 hazards. Note the green bulb is still wired to the ignition circuit in hazards mode. With my LED compatible flasher setup , just the dash bulb makes my relay flash even if nothing else is connected. Until the ignition is on , then it stops. Yes, firstly the bulb has probably blown in the knob of the hazards switch. Secondly , most likely at the moment the ignition power wire to the dashboard indicator light is not going to 12 volts with the ignition switched on. The alternator warning light and oil warning light probably dont come on with the ignition turned on either for the same reason. Heres a video..
