rhelm1953 Posted April 5, 2016 Report Share Posted April 5, 2016 Previous owner installed an overdrive transmission in my 1950 Special Deluxe but did not bother to install all the electrical connections, just a toggle switch on the dash to activate the solenoid. I've now installed the Overdrive relay and kickdown switch, added a seal for solenoid where there was none and am just about ready to test it out. However the overdrive lockout switch seems a bit sketchy, I measure about 20 ohms across the contacts when the switch is closed and that seems a bit high for a switch, I suspect an internal seal has failed and I have gear oil on the contacts. The switch appears to be a sealed unit and not serviceable and my on-line searches have not turned up a source for a replacement switch. Overdrive is Borg-Warner R10G, year unknown. Does anyone know a source where I can buy a switch, or for that matter is 20 ohms too much resistance? Appreciate any leads. Thanks Quote Link to comment Share on other sites More sharing options...
mopar_earl Posted April 5, 2016 Report Share Posted April 5, 2016 Would it happen to be the same switch used on the semi-autos trans? It thread in with two screws for the wires? Earl Quote Link to comment Share on other sites More sharing options...
mopar_earl Posted April 5, 2016 Report Share Posted April 5, 2016 If not internal resisted I'd say it's bad. You did removed the wiring before testing the resistance, correct? Earl Quote Link to comment Share on other sites More sharing options...
rhelm1953 Posted April 5, 2016 Author Report Share Posted April 5, 2016 It does thread in with two screws for the wires, I can take a picture this evening and post it. Yes, there were no wires attached to the switch, I tested it on the bench and in the car with the same results. Quote Link to comment Share on other sites More sharing options...
mopar_earl Posted April 5, 2016 Report Share Posted April 5, 2016 It might be the same switch they call an interrupt switch on the semi-auto trans. See them on eBay in the past. On the semi-autos it kills the ignition to allow it to downshift. They have uae a rubber boot that is on eBay. I can't say it's the same switch but sounds like it. Is it normally open or normally closed? Earl Quote Link to comment Share on other sites More sharing options...
mopar_earl Posted April 5, 2016 Report Share Posted April 5, 2016 (edited) Can't say this is correct for your application or not. http://m.ebay.com/itm/400676762221 Earl Edited April 5, 2016 by mopar_earl Quote Link to comment Share on other sites More sharing options...
dpollo Posted April 5, 2016 Report Share Posted April 5, 2016 I believe it is the same switch that is used on the semi auto. Make sure the little bullet has been inserted between the shift rail and the switch when you install your new one. The unit will operate just fine without the switch but you will be operating the electrics when it is locked out and that is not a good thing for the engagement solenoid. Quote Link to comment Share on other sites More sharing options...
Dodgeb4ya Posted April 6, 2016 Report Share Posted April 6, 2016 Here's the OD lock out switch plunger and a pic of the same lock out switch as used on the M-6 semi auto trans.... Quote Link to comment Share on other sites More sharing options...
rhelm1953 Posted April 6, 2016 Author Report Share Posted April 6, 2016 Thanks Earl and every one, I compared the switch on ebay to the one from my car and it looks like a match. I've purchased the switch and should have it in a week. One step closer to getting my Plymouth back on the road. Included a couple of pictures because everyone likes pictures, plus I want to see if it works. I have also converted to electric wipers and will add a post on my experience. Quote Link to comment Share on other sites More sharing options...
Dodgeb4ya Posted April 6, 2016 Report Share Posted April 6, 2016 Beautiful car!! Quote Link to comment Share on other sites More sharing options...
dpollo Posted April 6, 2016 Report Share Posted April 6, 2016 Absolutely gorgeous. If I were to have only one car, I would have a 50 Plymouth. Quote Link to comment Share on other sites More sharing options...
DJ194950 Posted April 6, 2016 Report Share Posted April 6, 2016 what did you use for the electric wiper motor change over? Plans for a floor covering?? Great looking 50! Thanks, DJ Quote Link to comment Share on other sites More sharing options...
rhelm1953 Posted April 11, 2016 Author Report Share Posted April 11, 2016 Thanks to Earls ebay skills I now have a good lockout switch but now I realize the plunger is missing as well. Does anyone have an extra plunger for the overdrive lockout switch they would be willing to part with? If so let me know. If no one has a spare plunger can someone send me the dimensions (diameter and length) so I can get one made. I am now beginning to understand why all of the overdrive controls were bypassed and there was just a toggle switch to activate the solenoid... Thanks for any help! Quote Link to comment Share on other sites More sharing options...
Howard Tarnoff Posted June 9, 2016 Report Share Posted June 9, 2016 I believe it is the same switch that is used on the semi auto. Make sure the little bullet has been inserted between the shift rail and the switch when you install your new one. The unit will operate just fine without the switch but you will be operating the electrics when it is locked out and that is not a good thing for the engagement solenoid. Can you elaborate on running the overdrive without the lockout switch and what it may do to the engagement solenoid? Thanks! Quote Link to comment Share on other sites More sharing options...
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