has anyone used a horn relay for OD

[JohnS48plm]

I was wondering if a horn relay could be substituted for an overdrive relay. They both perform the same function of using a small amp load to control a larger one.

I have an extra horn relay that I may try just to see if it works. Has anyone tried this before? JohnS

[martybose]

Most horn relays are not designed for continuous duty, which you need for the OD's. There is also the minor detail that the solenoid is actually a double solenoid, and you need both to shift, then just one to hold it engaged.

Marty

[JohnS48plm]

The overdrive relay I have uses ignition for power to the coil with the coil being grounded by the rail switch and governor. the ignition and ground terminals do the same thing. The power for the solenoid comes from the voltage regulator to the relay going through to the solenoid terminal when the coil is energized. The battery and horn terminals should do the same.

I'll try just to see what it does and let you know how it works.

JohnS

[james curl]

I tried to use a horn relay on my 55 Chevy. pick up when I installed the O.D. The relay failed in short order; it could not take the continuous load and failed the pull in coil. I believe Horn relays are meant for intermittent use. I would try to find the spec. for the relay. I am using a small cheap twelve volt relay from Radio Shack for my O.D. and another for my horns.

[Young Ed]

Dads 50 ply has a 12v relay used in car alarms. It works fine on 6v electrics.

[JohnS48plm]

I have a 12v relay from radio shack, it pulls in most of the time but every once in a while it doesn't. Maybe I'll have to try the car alarm one. JohnS