bradleyheathhays Posted December 11, 2022 Report Share Posted December 11, 2022 I have a Griot's G9 Random Orbital Polisher I got off ebay a few months back and didn't actually plug it in til this week. Turns out it doesn't give any indication of wanting to work at all. Motor brushes seem to be ok and I have no idea what to look for next. Any advice on what to check next on this thing to get it running again? 1 Quote Link to comment Share on other sites More sharing options...
wtnhighlander Posted December 11, 2022 Report Share Posted December 11, 2022 Small tools like that often suffer switch failure. If you have an ohm meter, connect it across the blades of the power plug and operate the switch to see if you get any change in resistance (put the brushes in first). There may also be an open connection in the internal wiring, but you will need to open the case to do point to point tests. Quote Link to comment Share on other sites More sharing options...
Coop Posted December 11, 2022 Report Share Posted December 11, 2022 And it didn’t go bad on your shelf. Real pisser that someone would stoop that low to sell something on eBay that they knew didn’t work! Quote Link to comment Share on other sites More sharing options...
bradleyheathhays Posted December 11, 2022 Author Report Share Posted December 11, 2022 Yep. Lesson learned I'm afraid. Thanks for the advice. I'll crack it open and start checking. Quote Link to comment Share on other sites More sharing options...
bradleyheathhays Posted December 11, 2022 Author Report Share Posted December 11, 2022 I've checked continuity in the power cord all the way up to the part I'm holding, which is the trigger switch itself with the power cord input leading in from above. Which parts should I get the probes on when I'm working the switch and testing for continuity? Quote Link to comment Share on other sites More sharing options...
Tom King Posted December 11, 2022 Report Share Posted December 11, 2022 First check the blue to either, or both whites and see if power is getting there. If not, check the blue to red. Let us know the result. Is the thing with all the other wires a speed controller (potentiometer)? Quote Link to comment Share on other sites More sharing options...
bradleyheathhays Posted December 15, 2022 Author Report Share Posted December 15, 2022 After this last round of testing I'm guessing this switch is actually working like it should. The black and blue wires share the same terminal. When the switch is off the left white and black wires show no connectivity, but when on they do. Since this is reaching the edge of my electrical / motor construction experience I'm thinking I'd be better off just getting another one rather than having to be hand held through more testing. Quote Link to comment Share on other sites More sharing options...
Tom King Posted December 15, 2022 Report Share Posted December 15, 2022 If the switch is working, it's probably the pot (potentiometer) that controls the speed. See if there is a part number on the pot, and Google "Potentiometer followed by that part number". It probably costs a few dollars. Quote Link to comment Share on other sites More sharing options...
bradleyheathhays Posted December 15, 2022 Author Report Share Posted December 15, 2022 Well, I did the search but nothing came back, at all actually. Can't see any other numbers and the red knob seems well attached. Not sure how easy the change out would be. Is there maybe a parts specific search engine I could put these numbers into? Quote Link to comment Share on other sites More sharing options...
Tom King Posted December 15, 2022 Report Share Posted December 15, 2022 Maybe only available in China. Did you leave a review on ebay? If not, contact the seller and tell them that you will leave a bad review if they don't refund your money. edited to add: Or at least contact these people: https://www.griotsgarage.com/?code=PPC04&gclid=Cj0KCQiAqOucBhDrARIsAPCQL1bEVvKLjq9FjnniBBAFe8tVtaGlV-8lAn8lY-Mk-TgXj_tZWThcr8IaAuTCEALw_wcB Quote Link to comment Share on other sites More sharing options...
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