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(ET) Intermittent 3rd speed on E12



Most of the time, I can't get the 3rd speed to work on my E12. Have done some testing but if its a bad connection, I have not been able to find it. With help, have temporarily put in a bypass circuit with spare contactor in parallel with contactor 2A over to wire #25 that gets me from 2nd to third speed and holds it (after hitting the power pulse switch). In studying ET literature, I found a flow chart that says to check diode CR12 on the Varistor assembly. I re-soldered the ends to the Varistor board but no change. Would like to replace this CR12 diode. I know very little about this type of thing and went to Radio Shack but they knew nothing. Can anyone help in identifying this diode for me so that I can locate and buy a new one?
Thanks in advance,
Richard "Zack" Zachary