I tested my J-105(1980's) igniters.
When I closed the switch during the test the light came on.
But when I opened the switch the light stayed on for about one second.
I varied the rate of switching but it had no effect, the light stayed on for about one second after the last switch closing.

Vin

 

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There is no question. What do you want to know?

 

It might be normal behavior. I've seen it happen on J-109s when they encountered too many pulses during CAS testing. When you overload its VR input, the signal conditioner circuit gives up (resets) and leave the C terminal grounded for about one second, which is similar to what you've described.

 

Thanks.
By the way what do you mean by overload?
Vin

 

Wouldnt a condensor help in this situation jeff? I had someone explain it to me a long time ago what the condensor does. If I remember correctly, its supposed to absorb any remaining charge, at a very rapid rate, in the circuit when its opened.

 

The first thing i did was swap out the old condenser for a new one.
They're hard to test and they’re cheap.
Thanks!
Vin

 

I was testing a 2nd gen CAS (crank angle sensor) which has 12 teeth per engine revolution compared to two of a 1st gen distributor. It's actually 24 teeth per engine cycle (two revolutions) for the CAS and four teeth for the dizzy. When the circuit gets more pulses than it was designed for, it stops conditioning the incoming pulses from the CAS or dizzy pickup (VR sensor) and the test light will just sit there and stay on for about one second after the pulses stop.

Alak, I don't know. I always leave the condensor in the circuit for RFI protection.

 

The light staying on during the test must be ok because my ignition system is fine now and I'm using the same igniters.
Thanks,
Vin