Home » Public Forums » GMCnet » Onan No Spark
| Re: Onan No Spark [message #280764 is a reply to message #280283] |
Fri, 26 June 2015 08:40   |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma:
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Senior Member |
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The biggest failure of these old boards is poor connection either due to corrosion on the connectors or cracks on the board runs/connectors. Second is the electrolytic capacitors. Third is the diodes. If yours has the original glass case diodes, replace them and replace the two electrolytics while you're at it. Examine all the printed wiring and especially the blade connectors on the wiring side with a magnifying glass, looking for cracks. Apply 12 volts (I use a wallwart) DC to each relay coil directly and note that the relay pulls in. If the board passes these tests it is likely working and the trouble is likely someplace else. You can replace every component on the board except the relays for less than 20 scoots. A couple - particularly the UJT - are hard to find but seldom fail.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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