Drop down test

[The Force power]

I've been searching through the "archive" of previous posts regarding a drop down test but can't really find my answer.

With the engine running pull the plug wire of the Spark plug to test a change or not.
It is advised to have the spark plug grounded when checking the ignition-system, so it will not damage the (Prestolite) switch-boxes.

Here's my question;
In order to do the drop down test, do I unplug the wire to the coil?

 

[jerryjerry05]

No.
The cyl. drop test.
Just unplug the wire at the plug as it runs.
Use insulated pliers and leather gloves and stand on a piece of wood.
Even then it can get ya!!
If the cylinders firing the hot is looking for someplace to go and YOU'R the easiest route.

 

[The Force power]

No.
The cyl. drop test.
Just unplug the wire at the plug as it runs

Thank you Jerryjerry,

I'm just trying to understand, why it would not damage the switch-pack when you pull the plug?
the built-up current can't go any where

 

[Nordin]

Your are thinking in the right way, but when doing a drop down test you just pull the HT wire for maybe 1-2 seconds.

Doing a compression test with not grounding the plugs you usually turn the engine over for 8-10 seconds and that is more dangerous for the CDI boxes.

 

[The Force power]

Your are thinking in the right way, but when doing a drop down test you just pull the HT wire for maybe 1-2 seconds.

Doing a compression test with not grounding the plugs you usually turn the engine over for 8-10 seconds and that is more dangerous for the CDI boxes.

THANKS:whoo:Nordin

 

[Redbarron%%]

The ungrounded plugs might not damage the box, but the high voltage with no drain from the plugs might easily damage the coils and that might damage the box.
But... I have limited experience with these engines.
You could unplug the trigger wire and perhaps get to it easier and with less risk?
Of course the problem might be the breakdown of the trigger circuit as well.
I had this problem. The engine would run OK at low rpm on the hose, but not pull underload in the water.
A new trigger coil took care of my problems. but at the same time I complicated my system and thinking bu converting to the CDM modules and eliminating the CDI box.
That set in play the questions about the trigger bias circuits.

 

[The Force power]

thank you for your input

 

[The Force power]

No.
The cyl. drop test.
Just unplug the wire at the plug as it runs.
Use insulated pliers and leather gloves and stand on a piece of wood.
Even then it can get ya!!
If the cylinders firing the hot is looking for someplace to go and YOU'R the easiest route.

I went & bought the tool.

I wrapped additional tape around the handles & fork as far as possible to minimize/eliminate current-jumps.
have not tried it yet