Tacho test for output from Permatune CDI ?, any way to test with multimeter for a pulse ?. |
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Tacho test for output from Permatune CDI ?, any way to test with multimeter for a pulse ?. |
porschetub |
Sep 27 2022, 03:57 PM
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#1
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Advanced Member Group: Members Posts: 4,725 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
Have issue with 2 tach's not working and after testing all connections @ tach and Tach-adapt I'am left with the black/purple wire from the CDI (3 pin) to test.
My later tach (low voltage ) will cause the Tach-adapt LED to come on with the ignition on and the needle bounces when cranking however with engine running ...nothing. My early tach (high voltage) isn't working and this is the one I will convert to Ashlock-tech circuit board replacement but need to know the pulse from CDI is working. TIA,cheers. |
Retroracer |
Sep 27 2022, 07:18 PM
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#2
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Senior Member Group: Members Posts: 620 Joined: 7-July 13 From: Bend OR Member No.: 16,100 Region Association: Pacific Northwest |
Agree that a 'scope is best for debug of the CDI tach pulses. An alternate might be:
battery powered scope a little funky to control, but is battery powered, so one less cable to trail over the car. With the motor idling at 1000rpm, you should see pulses repeating at a 50Hz rate. - Tony |
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