- Location
- United States
how do you test to see if your CDI is working?
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Octane how to test a cdi?
- Thread starter NVGuy
- Start date
- Location
- Burnet, Tx
Check kill switch
Check for poor connections in electrical box
Check ignition coil resistance
Check stator
If these are all good check for power at red/purple wire to CDI while cranking engine. (Or simply hook red/purple wire from CDI to another red/purple wire and check for spark. ) If the LR module is bad it will not send power to CDI and it will not spark. Hooking red/purple wire directly to power by-passes this problem for testing purposes.
If components above and LR module check OK and there is still no spark, then the CDI is bad.
Check for poor connections in electrical box
Check ignition coil resistance
Check stator
If these are all good check for power at red/purple wire to CDI while cranking engine. (Or simply hook red/purple wire from CDI to another red/purple wire and check for spark. ) If the LR module is bad it will not send power to CDI and it will not spark. Hooking red/purple wire directly to power by-passes this problem for testing purposes.
If components above and LR module check OK and there is still no spark, then the CDI is bad.
If the LR module is bad it will not send power to CDI and it will not spark. Hooking red/purple wire directly to power by-passes this problem for testing purposes.
I have read to test the LR module I disconnect all the wires
and connect the black/white (ground) to bypass the module.
You mention bypassing with the red/purple (power). Are both
of these valid tests? Or do they test different things?
Thanks!
- Location
- Burnet, Tx
Hooking the red/purple wire from the cdi to another red/purple wire stops the LR module from effecting the ignition system. As it is wire from the factory power to the cdi is controled by the LR module, which will only send power to it when it senses engine rpm.
Hooking the red/purple wire from the cdi to another red/purple wire stops the LR module from effecting the ignition system. As it is wire from the factory power to the cdi is controled by the LR module, which will only send power to it when it senses engine rpm.
You mention sensing engine RPM. Does this method of bypassing the
LR module also help a STARTING problem (when there's no RPM yet)?
Maybe if the LR module is hosed up it won't stop OR start properly... :question:
Thanks!
- Location
- Burnet, Tx
The LR has two funcions. One, it is the voltage regulator. Second it uses the battery charge coils of the stator to sense engine rpm and then switches on power to the orange wire. This wire is connected to the bilge pump and the cdi through the terminal board. If the LR has failed so that it does not send power to the orange wire you will have no spark and so the engine will not start. Also if the battery charging coil of the stator has failed or is not hooked up, the LR can't sense rpm and will not power the cdi. This will also cause the engine to not start.
(I assumed by "starting problem" you meant the engine is spinning over but not starting. If you are pushing the start button but the starter is not spinning the engine, the LR is not involved in that problem.)
(I assumed by "starting problem" you meant the engine is spinning over but not starting. If you are pushing the start button but the starter is not spinning the engine, the LR is not involved in that problem.)
- Location
- Burnet, Tx
Just hook the red/purple from the cdi to another wire of the same color (which should be hot at all times).
Just hook the red/purple from the cdi to another wire of the same color (which should be hot at all times).
The red/purple wire from my CDI changes to orange via an
inline coupler and connects to an orange terminal. I want
to disconnect it from the orange and connect to red/purple?
Or does it sound like I'm not looking at the correct thing?
- Location
- Near Seattle WA
Send the CDI to me... I will "spin test" it up to 10,000 Rpm for $40.00
wcc@watcon.com
wcc@watcon.com
- Location
- Burnet, Tx
You can move the orange end of the orange-red/purple jumper to a red/purple terminal on the board for the test.
If you look at the red/purple wire from the stator, you will find an extra connector that has been tied back. This was where the red/purple wire to the cdi was hooked up when the ignition system was originally designed. They installed the orange-red/purple jumper to eliminate a problem some machines had after they had been warmed up. These machines would not start when warm, but they found that if power was momentarily disconnected from the cdi they would start right up. The jumper changes the wiring so the LR module disconnects power to the cdi whenever it does not sense engine rpm at the stator.
If you look at the red/purple wire from the stator, you will find an extra connector that has been tied back. This was where the red/purple wire to the cdi was hooked up when the ignition system was originally designed. They installed the orange-red/purple jumper to eliminate a problem some machines had after they had been warmed up. These machines would not start when warm, but they found that if power was momentarily disconnected from the cdi they would start right up. The jumper changes the wiring so the LR module disconnects power to the cdi whenever it does not sense engine rpm at the stator.