This is an image i lifted off Ebay, but serves the purpose. There is a live to one side of the switch and when the rod is fully extended makes a circuit and passes the live to the connection on the box. This only happens when the rod is fully extended. I.e. in my car at full wide open throttle. Is this right? I guess when you boot the accelerator you want the circuit? Or should it activate just before fully open throttle? What is the middle yellow wire for as this has snapped off at the main connector on the body on mine, remanufactured ones on Ebay dont even have a connection to this middle wire.
That would be the electrical kick down (passing gear) signal for the ST300 or ST 400 transmission. At full throttle 12 volts energizes the kick down solenoid inside the transmission pan. That switch also controls the switch pitch torque converter stall in some transmissions.
no not just at wide open throttle, at 60% throttle there will be power to make the switch pitch converter go to high stall, plus if your micro switch is working there should be power at idle for the converter to be in high stall too.
This is my actual switch, can anybody help me as to where WIRE A and WIRE B go, its a 65 WILDCAT, thanks, all the best Andy
I would get a copy of the 1965 Buick Chassis Manual. Pretty cheap on Ebay, https://www.ebay.com/itm/1965-BUICK...=351745105708496fd6b0d10a4587813a202395e72868 You should be able to figure out where each wire goes with a meter. The plug on the right side of your picture is the electrical connection at the transmission. There are 2 flat blades that the plug attaches to. They look like this, The vertical one is the kickdown (passing gear). The horizontal one is for the switch pitch stator operation. Pass 12 volts to the kickdown, the transmission down shifts. Pass 12 volts to the stator blade, you get high stall, take it away, low stall. You already know what wire is 12 volts in. The wire that gets 12 volts with the plunger fully extended goes to the kick down. The one that gets 12 volts at 60% extension is for the stator (stall speed)connection.
they go to the two connections sticking up. should have one more on the bottom that the power orange wire coming out of the wire harness coming across the pass side.
I'm not even sure this car still has the switch pitch. He's in the UK. You would think the car was all original being in another country, but after 55 years, who knows?
Yeah, im in the UK, the car came from Classic Gas in Colorado (they moved to Texas) , it was exported to Dublin Ireland, then to Lithiania, now its in Manchester UK and i am restoring it. Its a patina car and has caused me a lot of issues so far with stuff failing, but you get that patina i guess by pretty much leaving it alone, and not touching it. So far im on Full Carb to Pan engine rebuild, brakes, etc etc.. The car i would say is pretty much untouched, but i have no micro switch connection wiring. That kick down rod passes the voltage at 60 percent wide open throttle, the wire that is connected is to top horizontal spade. The switch pitch. The vertical Wire “B” yellow is not connected to anything. So I guess I have no kickdown . The middle wire “A” on my drawing has no effect on either of the big terminals with the rod in or out Could I join the kickdown wire to the switch pitch wire to achieve both at 60% open throttle or is that a bad idea?
Stock, the switch pitch was high stall at idle (voltage), low stall just off idle (no voltage), and back to high stall at 60% throttle and above. The kick down could also be activated at 60% throttle, but the valve body calibrations were different with a switch pitch transmission. They usually would not kick down until full throttle. This article explains it, http://www.buickperformanceclub.com/SPTrans.htm BTW, there are electronic control boxes that manage switch pitch function. V8 member Bruce Roe makes them. They employ 3 separate timers, and a vacuum switch to control the switch pitch and tailor it to your needs. The box does not control kick down, but I bet Bruce could add that somehow. Or you could use the B&M switch meant for that purpose. https://www.summitracing.com/parts/bmm-20297
More info, http://v8buick.com/index.php?threads/controlling-a-switch-pitch.356444/#post-3054026 Read my comments in this thread, http://v8buick.com/index.php?thread...es-electronic-controller.190075/#post-1663402 I had Bruce modify my box so that it went from Brake On high stall to low stall immediately. The way the box brake on timer works, you cannot adjust it below 3.2 seconds. If you do order Bruce's box, you might want to talk with him about that. Being you are in the UK, it would not be easy for you to return it for modification as I did.
You have the correct switch for a Super turbine 300 and 400 transmission. you don't need to buy a special box or timer. Go to this link and it will show you exactly what each wire and connection does. https://www.teambuick.com/reference/sp_400_wiring.php
