Overdrive relay
 

1955 Ford F100 - switching to 12v. Need wiring info/diagram on 12v OD relay. My old one had 6 wires going to it. Picked up a mid 60's Rambler 12v relay (think its #3167318) with 6 posts. However the posts have stampings on them that do not correlate to the Fords. It has two NO, NC, B, 1 & 2. Has fuse on one side stamped NO & B; one end crossed posts 1 & 2; other end crossed posts NC & NO. Can anyone help me getting this wired in as I already have all the other 12v stuff for the conversion. "Petty3377@msn.com" or text 505-635-4291 ... can send pic

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There was a post on the HAMB about this. A guy gutted the stock relay enclosure and installed a modern 12 volt cube relay inside the old enclosure. I'm going to do this when my project gets to that point. I saved more details if you need them. Let me know.

Hi, sorry to brake in like this, but any info will be apprciated. I'm rebuilding my 55 truck which has an overdrive but i don't know if the relay is still functioning or not, same goes for governor en solenoid. Your tip about rebuilding the relay with a simple modern cude relay is a great one. Save's me a bunch of $$$
So if you have a wiring diagram? That would be appriciated...

Does the cube-relay conversion momentarily kill power to the points like the original? I can't think how it would.

B6AZ-7A651-A .. 12V Overdrive Relay / Obsolete

1956/58 F100 // 1956/58 Ford Passenger Cars & Thunderbird. Ditto 1959 before production date 6/1/1959.

HILLTOP CLASSICS in China Grove NC has 2 = 760-746-0400.

Studebaker used a similar 12V relay.

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Here is a good post/link on the subject from the HAMB: https://www.jalopyjournal.com/forum/.../#post-7985405
Also these are some things I saved for my use when I get to that point in my restoration.
Ross, admittedly I don't have an understanding of electrical theory beyond the basics. It was my understanding that one of the poles of the kick down switch under the gas petal initiates the brief interruption of ignition. Maybe I'm wrong??

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The ignition switch can be quickly switched off and on and the result will be the same as hitting the "kickdown" switch. The OD will disengage. Another interesting thing about these units, the governor can be bypassed and replaced with an "on - off" toggle switch which will give you six speeds forward by allowing the OD to be engaged in second and first gear. After fifty plus years I forget exactly what the problem is but the reverse interlock is affected and I believe you must pull the OD cable to get the unit out of OD before the vehicle will go into reverse. Or maybe the vehicle is prevented from going backwards. Use caution.
And of course, we all know the OD gives clutchless shifting once the vehicle is moving. .
IMO, the OD was the greatest feature one could have on these old vehicles.

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THANKS! for the electrical scheme on the overdrive!

Thanks for your info, would you, by any change, know how to test if the governor still functions?

Put governor in a vise, attach electric drill to shaft. Attach one lead of volt/ohm meter to governor lead and the other lead to the case of governor. Have meter set to test for continuity. As the spinning governor gets up to speed the meter should show full deflection or continuity. At that point the governor is acting as if if has reached it’s about 27 MPH cut in speed.

Hope me this helps,

tom

GREAT! Thanks for enlightening me, will give this a shot!