MOPED ARMY

Tail wiring wonky kill engaged

Regulator grd out hooked to cdi grd

bring it over sometime, we'll fixit ;)

maybe point some good light on The left side engine area and post a few really good pictures of the situation. then you might be able to get some info of what you got going on there!!

Note I'm making some assumptions on the CDI circuit design based on what seems to be common in the industry; there's a thousand ways to skin a cat.

My guess is that the most likely component to fail in a CDI box is the Silicon Controlled Rectifier (SCR). Fortunately this is a device that you can test, and it's pretty easy to test with a multimeter, even with it in the CDI circuit.

Assuming:

1) The SCR anode is connected to the ignition coil and the CDI capacitor

2) The SCR gate is connected to a trigger signal, through a resistor

3) The SCR cathode is connected to the bottom end ("ground") of the primary winding on the coil

Step 1: Put your multimeter in resistance mode (use a high range if using a manual meter)

Step 2: Connect the positive lead to the SCR anode, connect the negative lead to the SCR cathode. The meter should show an open circuit (high resistance)

Step 3: Reverse the leads (positive to cathode, negative to anode). The meter should show an open circuit (high resistance)

Step 4: Connect the positive lead to the SCR anode and the SCR gate, connect the negative lead to the SCR cathode. This should turn on the SCR and show a short circuit or low resistance.

Step 5: While leaving the SCR anode and SCR cathode connected to the meter, remove the connection to the SCR gate. This should continue to show a short circuit or low resistance, showing the latching behavior of the SCR (important).

With the CDI wired up, remove the one wire going to the HT external ignition coil's positive connection. Remove the spark plug. Set a multi meter to AC VOLTS, 200 scale. Hook red lead to HT coils lead and black to a good frame ground. Crank the engine over and you should see ac volts.