Re: dist. thunderbolt III
Ignition diagnosis often is a simple process of elimination. Testing components to prove them good/bad one at a time.
Specialized meters can make the process easier, but there are tests methods that can serve effectively.
Proving the battery-cdi unit good, the rotor, cap and plug wires good, effectively isolates your problem to the trigger. Faztbullet has pointed out the input and output required from the trigger as it turns.
In case you have not proved the battery-cdi unit good/bad, I copied this from the CDI Ignition Troubleshooting Manual available for FREE from CDIElectronics.com
NO SPARK
1. Connect a spark gap tester to the high-tension leads coming from the distributor cap and set the gap to approximately 7/16?.
(Use of a CD Tester is recommended).
2. Align the rotor with #1 spark plug wire. Disconnect the trigger wires and connect a jumper wire from the brown trigger
terminal to the white trigger terminal.
3. Connect another jumper wire to the black trigger terminal turn the ignition switch on. Strike the jumper wire from the black
terminal against engine ground ? (DO NOT HOLD THE JUMPER AGAINST ENGINE GROUND). Only the #1 spark plug
wire should fire. If any other spark plug wire has fire, there is a problem in the distributor cap.
4. Repeat the test for the other cylinders.
Another poster has had a similar problem, see
http://forums.iboats.com/showthread.php?t=446811&page=1
