Can't get advance to read properly and was hoping someone could shed a little light on my problem.
Tester is a Sun EDT-5001, the last distributor tester made by sun.
Some backstory: originally misread the manual and used the instructions for a different type of electronic distributor that said to mock up the whole system.
Used a nutter bypass schematic to make this.
After several hours of frustration and figuring out the ignition box needed power as well (oops) I got everything running mostly.
Was so very fun to play with and watching the sparks was great except I couldn't figure out how to hook up and read advance since the lead it said to connect to the coil had 12 volts running to it so it would override the coil.
Finally closely read the instructions again and discovered seperate instructions that said for ones with a magnetic pickup all you need to do is hook up these 2 leads to the pickup like this.
After yelling at myself for not reading closer I hooked up the two leads and now it somewhat works.
My problem now is that with the distributor spinning the advance gauge shoots all the way to the right most of the time.
Bottom left gauge is advance.
Twisting the distributor in the clamp will change what the gauge shows depending on where I twist it to.
By fiddling with it with it spinning at 250 rpm (500 engine rpm which I think should have zero mechanical advance) I can get it to show zero advance for a couple seconds before it starts slowly creeping torwards the right edge.
One time I was able to get it to show the correct advance without jumping up but I bumped it a little and haven't been able to find a sweet spot again and would rather have it work right.
Cleaned the flange of the distributor and it is grounded to a grounding post.
Google is useless since all the stuff out there including the ones about duraspark systems is about the old testers like the old broken ex-military tester I have from the 60's and there is a apples and oranges difference between them and I couldn't find any issue like this out there anyways.
There is the possibility that one of the logic boards has a issue but I wanted to rule out the distributor first especially since I have a zero chance of finding replacement parts.
My knowledge of stuff like this is zero so I was hoping someone smarter than me would have a idea or two.