wiring a SEM lights

Each yellow gives you an ~70w coil, and the blue is a floated ground (i.e. - the generator output is NOT grounded through the frame). This way you can keep your AC and DC systems separate. So, instead of using a 1-wire regulator that shunts excess voltage to the frame, you'll use a 2-wire regulator that shunts excess voltage back to the blue. If you use something like the Trail Tech regulator/rectifier, connect both SEM yellows to the SAME yellow of the reg/rec, and connect the other yellow of the reg/rec to the SEM blue. Then the red/black of the reg/rec are your DC output to your 12v battery, and you should have a whole lot of DC electricity! Since your AC was NOT run through the frame, you can now use the frame as your DC ground for the battery, lights, horn, blinkers, grip heaters, GPS, whatever you want.

I have a 87 250xc. On the SEM ignition box there are 2 extra red wires.Does anyone know where they go? thanks

They are probably one red (goes to coil) and one orange (kill button).

the coil and kill button are already hooked up--- the 2 yellows are from the stator are for the lights. these 2 reds are extras from the ignition box

Can you post a photo of this?

Here is the picture of the control box with the 2 extra red wires.

With the lesser watt motoplat lighting I had a dim brake light. So I by passed the brake light switch all together and would wick the throttle when I was slowing down or stopping. This would blink the rear tail light as a brake light. It worked.

Looks like you have the SEM ignition module. I have 4 of those but I can not tell what the 2 reds are for.... yet

Might be switching gear for models that require brake on, clutchin, or neutral gear before starting maybe compliance wiring.