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Message started by gizzo on 08/12/16 at 20:18:34

Title: An electrical question
Post by gizzo on 08/12/16 at 20:18:34

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.

Title: Re: An electrical question
Post by Gary on 08/12/16 at 21:16:38

Yup something tricky with diodes is the trick. :)

Title: Re: An electrical question
Post by hotprops on 08/12/16 at 21:33:24

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

Title: Re: An electrical question
Post by gizzo on 08/12/16 at 21:34:20

Sweet. thanks Gary. I'll ask the guy at the electronics shop to sell me the right ones, i guess.

Title: Re: An electrical question
Post by gizzo on 08/12/16 at 21:36:20

2423383C3E233C3F4C0 wrote:

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

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.

Title: Re: An electrical question
Post by verslagen1 on 08/12/16 at 22:02:46

the 2004 wiring diagram has a single light for both.

one leg of the light is left the other right going to the switch.

http://i757.photobucket.com/albums/xx211/babyhog/S40/2004WiringDiagpg1.jpg

Title: Re: An electrical question
Post by gizzo on 08/13/16 at 02:05:25

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

Title: Re: An electrical question
Post by Dave on 08/13/16 at 04:13:43

I love electrical questions....the are more fun than Sudoku!

To make both turn signals run a single light, get the Diode setup.

http://www.ebay.com/itm/Kuryakyn-L-E-D-Turn-Signal-Diode-Kit-/272319472456?hash=item3f67816348:g:lcwAAOSw-7RVEML5&vxp=mtr

There really is no need to try and use the stock wiring harness light indicator for a lot of the new speedo functions.......a lot of the wires are already up in the headlight housing. You can get power from either running light wire, the front turn signal wires can provide a place to connect your new Diode, the yellow wire will give you the High Beam headlight signal.

Title: Re: An electrical question
Post by Armen on 08/13/16 at 04:35:29

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.

Title: Re: An electrical question
Post by gizzo on 08/13/16 at 16:03:20

Thanks gents. I'm having trouble deciphering versy's wiring diagramme. Is it saying that each wire from the lamp goes to the power wire of each side indicator? I tried that yesterday just to see what happened but it didn't work properly. It also appears that there are 3 wires to each indicator (our indicators only have 2), or does the third represent power going to the back indicators?
Thanks again. BTW the bike is using incandescent bulbs. All the other lights hooked up fine and work perfectly. Was a lot of fun (!) figuring out the wiring because the PO had done such a butcher job on the loom and pulled everything off, it's all crimp terminaled, wires added here and removed there. But we got on top of it eventually and reversed some of the major fubars.

Title: Re: An electrical question
Post by verslagen1 on 08/13/16 at 16:11:19

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.

Title: Re: An electrical question
Post by gizzo on 08/13/16 at 16:59:34

Oh ok. Thanks.

Title: Re: An electrical question
Post by Ruttly on 08/13/16 at 20:03:27

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 !

Title: Re: An electrical question
Post by gizzo on 08/23/16 at 02:39:01

So, the two diodes did the trick and the blinkers and single indicator light all work perfectly. 35 cents well spent. Thanks guys.