54 Mercury-box on firewall ID

[Bob from Northport]

Can anyone advise what this electrical box is on the firewall of my 54 Mercury.?? Seems like A HEAVY gauge wire running under the dash to the ignition switch I think..

 

[cadillac512]

If you have overdrive, is it the OD relay?

 

[Bob from Northport]

I do have an overdrive on the car. Have not tried it yet since I've had the car.

 

[miker98038]

Big wire to the relay to actuate the pull in coil on the solenoid. Then it switches over to a holding coil internally and the load goes down. I dont have a manual where I’m at, but I thought they were fed right off the battery (on my bird via the starter solenoid) and the coil circuit was thru the ignition. ?

Have you driven those overdrives before?

 

[KULTULZ]

https://www.oldcarmanualproject.com...ner Overdrive/pages/Overdrive_Page_01_jpg.htm

 

[Oldgearz]

That sure looks like the OD relay box as mentioned above. Fuse tips it off. If it has 4 wire connections, I'd bet on it.