Originally Posted by
fordsteve77
To stevos, its on an XR3i MFi 1988
When I disconnected it and plugged the 2 ends together the car started and ran and the voltage was 13.50 all the time the car was running, which was only 5 mins...?
What voltage should the outlet of the suppressor be around the 12 volt mark...?
The box is a series capacitor looking at that link. This BLOCKS DC ie, steady voltage so the output of the box will be close to zero. However! It will pass a pulse (AC Voltage) such as a flyback pulse needed to trigger the tach or other tach equipment.