Hopefully one of you guys can help me with a wiring challenge. I'm fitting a new speedo which has a bunch of warning lights built in. They replace the stock dash lights for neutral, high beam, oil pressure and indicators. The bike's stock dash has individual lamps for each side indicator. The new clock has one lamp that flashes when either side indicator is on.
Does anyone know how to wire this single lamp up properly?

I can't just connect both dash light wires to the new single light, because then both sides indicators will also light up.

I also tried picking up power direct to the flasher unit but there's continuous power there unless the indicator is flashing.

Will I need to do something tricky like fit a diode in each of the dash lamp wires before they join the new single light wire?

Thanks in advance guys. Electrical work is not my secret super power.

how the f... did i drive all those miles on m bsa ,and thrimph without those lites?

hotprops wrote on 08/12/16 at 21:33:24:

I'd be surprised if your BSA had any lights working anyway.
It's not my bike and the owner would quite like the dash to work properly. I'm helping my daughter's boyfriend build a CX500 cafe racer.

Thanks versy. Ill llook at that whenim less beer on board. Cheers

Also, if you are using LED turn signals, they prob won't blink at the correct rate because the load is less than the turn signal was designed for.
Just go to the auto parts store and buy an electronic T/S relay that doesn't care about load.
Easier than running the ballast resistors.

3 wire to the front sig's... 1's a running light.
2 wire to rears... no running light.

that's the stock wiring diagram for the 2004
the 89 to 94 is similar.

I'm sure 2 diodes will do the trick.For flashers I have a selection of 2 prong automotive flashers , they all have different numbers. I just keep trying them till I get the flashing speed I want.
 On my street tracker the tail light is a dual set up 2 separate tail lights and no place to mount rear turn signals. So I started playing with diodes , thought I could do it with 3, but it needed 4. Now the dual tail light operates as tail/stop/turn signals without back feeding front turn signals when brakes are applied.
 Another time I had a Honda 90 that the battery was always dead , looking at the diagram traced prob to selenium rectifier and stealership wanted triple of what I wanted to pay. Looking at diagram noticed rectifier was 4 diodes so I soldered 4 diodes together with 4 wires, 2 from stator , 1 to battery , 1 to ground . Battery no longer goes dead .
  Diodes are cool way to resolve problems , kinda fun stuff , almost makes me feel smart , but we all know better !