question about Mike's R side controls vs my stock 80 one

emzdogz

Aunty Em
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I ordered a new right side run switch/starter button/throttle housing from Mikes. I had gutted the balls (contacts) out of my old stock one from the 80 SG, when I was having a problem with it years and years ago. (turned out to be bad ground, anyway that was years ago).

So the starter button still operated, it started and I left it like that.

But now, on my chopper project bike, even though the housing is bulky, I decided to buy one of the re-pop ones from Mikes. It's black, should be functional, and while somewhat bulbous, in this case function beats minimalist style (says me).

The original switch had three wires. This pic from the orig wiring diagram confirms that. I know the red/white and blue/white go back to starter solenoid and the brown is for power to the switch.
However! the new switch from Mikes has a 4th wire - a black one.

My question is what is the black wire for? I know in order for the kill switch to work I need to wire something into one of the coil wires.
Before I relocated my key switch to the battery box, I was just gonna use the stock pos. key to "kill" it if necc.

But now I want to go ahead and use the stop-run-stop functionality.

So what do I do with the brown and black wires? Do they create a switch like the brake light switch? so BOTH should be wired into a coil wire? Or is the brown just supposed to receive switched power and the BLACK wire gets attached to coil?

Here's a blow up of that area on the stock diagram:

(THANKS! btw. :))
 

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I'm using one of the minimalist wiring diagrams basically, btw, the one with a 20 amp fuse and then 3 10 amp fuses in other places.

I would just try different things with the wires, however the pipes and carbs are off the bike now and so I can't run it to see if it's working. Well I guess I could test for spark still, but if someone could explain what to do with the brown and black wires that would be great. Currently my 3-wire orig one just has the brown wire tied into the main brown switched power wire.
 
Since original assemblies don't have a black wire, I'd say you need to trace that in your new switch to see what it does. The last one I worked on (from a '79 I think) had brown (switched power) from the ignition switch running to one side of the kill switch, a R/W coming off the other side running to the coils. Basically, a simple cut-off in the power feed from the ignition switch to the coils.
 
Without ever having a Mikes unit in my hand. . .
My money says it is a ground wire.
 
Pics.
It's obvious which wires pertain to starter button and which to the stop/run/stop switch.
Blue white and the black wire go to starter button.

Red/white and the brown go to either side of "run" position. So I guess brown is switched power in and red/white goes to one of the coil wires.
That's what I'll try first, anyway.

thx!
 

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That black wire is indeed a ground, but that's not how the originals were set up. If you check your original, you'll see only one wire to the start button. The ground happens through the housing to the handlebars, through that clip below the black wire in your second pic. The black ground wire in your new housing is redundant. Hook it to a ground or don't, it's up to you. The housing should already be grounding through the bars - if your bars are not painted and if you have the ground in the left control hooked up. That's how it works stock - the right switch grounds to the bars which carries over to the left switch and to that housing. That housing IS grounded with a wire into the headlight.
 
but the starter solenoid has 2 pigtails. So it needs two wires running to it from starter button. I see where the black wire is just screwed to the bare metal clip that contacts the bars and makes the ground. So black and blue go back to the pigtails from solenoid?
I think my ground connection before was being made through the clutch cable. I swear. This was years ago. Nothing would get the starter motor to turn. Then I just happened to connect the clutch cable and boom, it worked.
 
The starter solenoid has 2 pigtails. So it needs two wires running back to it from starter button. I see where the black wire is just screwed to the bare metal clip that contacts the bars and makes the ground. So black and blue go back to the pigtails from solenoid?
I think my ground connection before was being made through the clutch cable. I swear. This was years ago. Nothing would get the starter motor to turn. Then I just happened to connect the clutch cable and boom, it worked.

I guess I need to hook everything up and see what works. Guess I'll take my old switch apart too. See what's really missing.
 
Yes, and look at the big picture, not just that little area around the kill switch. And I recommend a real factory diagram, not someone's Crayola special.

Yes, the starter solenoid has two small wires coming out of it (R/W and Blue/W) but they don't both go to the start button in the right housing, only the Blue/W does. Looking at a full diagram would tell you this. Unlike the kill switch which breaks or connects the switched power lead to your coils, the start button makes (when pushed) or breaks (when released) the ground for the starter. Press the button and make the ground, the starter cranks. Release the button, break the ground connection, and the starter stops cranking.
 
On the new switch it has 4 wires, a brown is power in from the key switch.
The red/white is power out to the ignition and the starter relay. In a stock wiring it would run to the safety relay then to the starter relay.
As talked about the black is ground. I might hook it to a good frame ground under the tank, extra insurance of a good ground.
The blue/white wire hooks to the blue/white wire of the starter relay.
When you turn on the key power flows to the right side switch, when you put the "kill" switch in run it sends power to the ignition and starter relay. To get the starter to spin this power flows out the blue/white wire to the starter push button. Push the button it connects the blue/white wire to ground. The button grounds to the housing, the housing to the bars, through the bars to the left side housing, the left side housing has a black ground wire to the harness ground in the headlight bucket.
This is how the later bikes are set up as stock. Your new switch has the extra black ground, as mentioned before I would hook it up.
Leo
 
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