(Topic ID: 182955)

Coil Resistance Question

By rfordut

7 years ago

Topic Stats

  • 4 posts
  • 3 Pinsiders participating
  • Latest reply 7 years ago by dr_nybble
  • Topic is favorited by 1 Pinsider


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#1 7 years ago

I'm working on a 1965 Williams Bowl-A-Strike. I went thru all coils and found a few that need replacement. I started with the chime relay that was shorted. I then moved to the lock relay, which was measuring low resistance compared to charts online and looked partially burned up. The game would play mostly after I replaced the chime unit.

But, when I replaced the lock relay, I have a new issue that popped up. I now get a green arc across one switch on the coin relay bank, which fires after the lock relay when I push the start button (simulates coin insert). The coin relay is a Williams Z35-4200 coil. I cannot find the resistance on any lists, so when I keep getting 215 ohms using DMM, I think something is wrong. However, I have a project 1961 Williams Ten Spot with that same relay and I'm getting a similar resistance. So maybe it's fine.

Not sure what to do. Any ideas?

#2 7 years ago

Those are high resistance coils, nothing unusual. Clean and gap the arcing switch, might improve things. Does that switch carry line voltage?

#3 7 years ago

Listen to dr_nybble.

And this may help : https://www.flippers.com/coil-resistance.html

LTG : )

#4 7 years ago

One on that chart is close:

A-26452 GOTTLIEB SPECIAL 137R 35 2450

4200/2450*137 = 235‎Ω

The coin relay on my 1964 Williams Heat Wave fires the relay bank reset monster 110V coil.

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