Overdrive Relay Wiring

[woodie49]

It looks like I will finally install my OD into the Woodie this weekend.

I do not have the regular relay, I am using a Bosch relay replacement that many sites recommend.

I have found a couple wiring diagrams, but nothing that is exactly the set up of the Plymouth. Based on those, I HOPE I have figured out the correct wiring.

Attached is the schematic for the bosch rely (for those of you who can make sense out of such data) and my best guess at the wiring diagram, relying more on other sites (Not Plymouth) and not on the schematic, which is not meaningful to me.

I am looking at figure 9 of the Borg Warner Automatic Overdrive manual for the factory wiring.

Can any of you guys tell me if I have this right or how to properly hook this up? I am going to use a manual interupt switch and rely on backing off the gas, so no primary ignition interupt circuit at the dizzy is needed.

Any feedback is appreciated.

BoschODRelay.pdf

[Ken Bartz]

I have used this wiring on my Plymouth and found that it works great. Here is how it works. Use the dash mounted switch to turn on the overdrive power (anytime). When the governor senses that the cars speed is over 28 MPH then the governor switch closes and will energize the relay. When the relay switch closes the overdrive solenoid will activate the lever inside the transmission and engage the overdrive function. When the cars speed drops below 28 MPH the overdrive governor will de-energize the relay and also the overdrive solenoid. I have found that just a little let-up on the accelerator will allow the solenoid to engage and disengage. As long as the car speed is above 28 MPH the overdrive will engage, even in 2nd gear. With the lamp installed somewhere on the dash you will know that when the light comes on the overdrive solenoid is engaged (very helpful).

[Ken Bartz]

I do not know how to get this schematic on this web site. I saved it as a .pdf and the file is 78K and this forum will not take a file that big. So then I moved it as a picture to PhotoBucket and it is not view-able. Suggestions?

[martybose]

Here's a link to a PDF file that shows the 12V circuit and BOM that I am using to control my OD unit on my 47 (which is equipped with an HEI ignition). Any questions, just ask! The prices are what I paid for them from McMaster-Carr a year or two ago. Adapt as necessary!

Marty

http://martyb.users.sonic.net/HEI-OD circuit and BOM.pdf

[woodie49]

Ken,

I had the same problem, but I was able to shrink the PDF by messing with the settings on my scanner.

If you just right click my name in the thread, there is an option to E-mail me and then you can just attach the schematic. If I can shrink it down (no promises), I will upload it for the benefit of any following the thread.

I think I essentially am trying for the same set-up, with the only differences being 1) I shouldn't need an "on" switch because it will be hooked into the ignition and the cable lockout will control whether it is operative or not, and 2) I will put in a manual interupt so I can manually control the kickdown function when I am above 28mph.

But your schematic, if you are using a similar relay, will certainly help.

Thanks

[steveplym]

I wired mine up just like the factory diagram with a few exceptions. Since I have electronic ignition the cut out won't work for me. So I eliminated that part of the equation. I'm using a normally closed push button switch under the dash for my kickdown switch.

I make the governor do most of the work. I get it up to speed and let off the gas, it goes right into OD. Then I can use the switch to kick it down if I'm going up a hill, etc. I hardly ever have to do this though. Unless the hill is pretty steep. Haven't had a problem with it yet.

[Don Coatney]

This might help.

[woodie49]

Since I don't have the factory relay, I am hoping that someone can make sense of the diagram on the Bosch relay and help me figure out which terminals on the Bosch correspond with the terminals on the factory relay. The Owners manual, pages 214, 215 and 217 are quite helpful. They indicate T.H. and Ign. terminals connect internally to a coil or resistor (or something else entirely that I don't understand), and the solenoid and bettery terminals connect internally to a point set.

I beleive that the "30" and "87" terminals on the Bosch connect to an internal switch (points) and that the "86" and "85" terminals connect internally to some kind of resister or breaker. The only thing I really know about electricity is that it hurts if you get too much of it too fast. Never had electric shop as a kid and there wasn't a need for engineering to become CPA, so I just really don't understand the diagram on the relay.

I have gotten a number of wiring alternatives, a couple of which use the Bosch relay, so I can infer from those what the correspondance is. But I think if someone out there knows how to read an electric schematic, this is probably a fairly easy problem.

But please keep sending the wiring diagrams as I am learning more with each one.

Don, GREAT diagram - I am not sure what the 3-way switch does with the kickdown and lockout in place. Is it just to insure you have powered off the system when you shut down and to provide a manual way to operate the kickdown? Neat diagram - your work is inspirational.