Mystery Switch #2

[dirty dan]

This one sits on top of the exhaust manifold next to the B&B Carb. Has one cut wire.

There's one "attaboy" for the first person that can tell me what it's supposed to do.

[1948Skip]

Dear Dirty Dan,

It is an automatic choke switch

Skip

[Ed Griffin]

That is your heat controled automatic choke. The lever on the side hooks to a linkage to the carb and the wire goes to the starter. Thats if it is working.

[dirty dan]

I guess when I get my manual it will explain how it's supposed to work?

[Ed Griffin]

Here is what the manual says or at least one of the manuals.

[dirty dan]

Thanks Ed!

[Norm's Coupe]

Actually, I don't believe P15's came with an automatic choke. Think that was only on the D24's, Chryslers and DeSoto that had the fluid drive and gyromatic transmissions. Someone may have replaced the manifold with one off of one of those cars and the choke switch was on there. It's not needed if you have the manual choke and the Carter B&B carb.

Dan, does your engine serial number start with a D24 or P15? If it starts with a D24 someone put a dodge engine in the Plymouth. Engine number is on drivers side of the engine, directly above the generator, on the block under the head.

[Jim Yergin]

I don't know about the P15s but one of my 1941 Plymouth P12 parts cars had one of those automatic chokes and it appeared to be original.

Jim Yergin

[dirty dan]

Actually' date=' I don't believe P15's came with an automatic choke. Think that was only on the D24's, Chryslers and DeSoto that had the fluid drive and gyromatic transmissions. Someone may have replaced the manifold with one off of one of those cars and the choke switch was on there. It's not needed if you have the manual choke and the Carter B&B carb.

Dan, does your engine serial number start with a D24 or P15? If it starts with a D24 someone put a dodge engine in the Plymouth. Engine number is on drivers side of the engine, directly above the generator, on the block under the head.[/quote']

SOB! P23, D**n! 1951 Engine.

Oh well. At least I get 2 hp over the P15.

[Norm's Coupe]

Dan,

That probably explains the automatic choke. Think they started putting them on in the 50's sometime. However, a lot of people like my father and grandfather changed theirs back to manual back then, so still no big thing to have a manual choke.

As far as your engine not being the one that came in the car. You probably won't find many that did come in their cars. For example, my engine does start out with P15. However, its a factory 47 replacement engine in the car. It was changed at one time or another in its lifetime. Even states that on my title.

[BobT-47P15]

Those sisson chokes have been appearling on ebay pretty regularly lately.

[dirty dan]

Those sisson chokes have been appearling on ebay pretty regularly lately.

Is the wire to it just supposed to be a 6V supply when the key is in the run position?

[Niel Hoback]

The wire to the choke is only hot when the starter is cranking. The wire should come from the terminal on the starter or at the other end of the starter cable at the solenoid.

The six volts is used to snap the choke fully closed only while you are cranking the engine.

After the motor starts, the manifold heat causes the bimetallic spring in the unit to fully open the choke.

Be sure the screw at the choke unit terminal does not touch the manifold .