Chevrolet switch plate - last version with 6 switches

[m606paz]

I share late dash plate found. Look autopulse switch hole.

[Hanno Spoelstra]

Originally Posted by m606paz

I share late dash plate found. Look autopulse switch hole.

And the left one had six holes vs. the usual five. That’s why I merged it here.

Did these plates come off a Ford? Until now it seemed they were only fitted to late Chevrolets.

[Beau Bruce]

Hanno, what is the auto pulse switch for do you know.? Is it a Europe feature.? Is it for an electric fuel pump.? I have never seen a switch plate here in Australia with that middle location being labeled, I have only seen them as blank.

[Maurice Donckers]

Beau , it is for a small auto pulse electric fuel pump , it was additionally mounted behind the battery box inside the chassis , to overcome vaporlock problems .

[Grant Bowker]

LWD parts has both the wiring for the pump at https://www.lwdparts.com/product/wir...mp-connecting/ and the pump at https://www.lwdparts.com/product/fuel-pump-6v/

[Jacques Reed]

Originally Posted by Beau Bruce

Hanno, what is the auto pulse switch for do you know.? Is it a Europe feature.? Is it for an electric fuel pump.? I have never seen a switch plate here in Australia with that middle location being labeled, I have only seen them as blank.

Hi Beau,

"Autopulse" was a company that manufactured electric fuel pumps. Interesting that Ford and Chevy both refer to it by the trade name and not its functional name in various publications and even on a switch plate.

I can only vouch for what is written in a Ford Parts List, and not Chevy, but it specifically states that the "Autopulse- std equipment Indian Army"
I have never seen one here too. But who knows.

No doubt it was used in other theatres but a Parts List written in 1943 was still mid war so maybe India was not exclusive. With vapour lock a problem in hot climates it would make sense to fit it on Australian delivered vehicles.

My late war original wiring harness included the wiring for it but a blank switch plate where it should go.

Cheers,

[m606paz]

Autopulse electric pump

[Jacques Reed]

Hi Mariano,

Nice photo of the Autopulse electric fuel pump.
I thought I would have a look at my original ignition switch tails again to figure how the Autopulse was wired up.

There is a doubled up red and black wire from the ignition switch. One goes to the resistor but I was not sure where the other one went. Wiring diagram states:
"No. 45- ignition switch to lead from Autopulse pump"
"No. 46- Autopulse switch to Autopulse pump"

Could not understand why there would be two leads to the Autopulse the way it read.

I believe No. 45 may just be a jump to the input side of the Autopulse switch as per attached diagram. With that arrangement one cannot run the Autopulse without having the ignition switch on. This would be a good safety feature. One can still start the engine without having to run the Autopulse, a valuable feature when not needed. It sounds very simple and perhaps that is all it was.

Would be interested to hear what others may think.

Cheers,

[Tony Smith]

Originally Posted by Jacques Reed

Wiring diagram states:
"No. 45- ignition switch to lead from Autopulse pump"
"No. 46- Autopulse switch to Autopulse pump"

Could not understand why there would be two leads to the Autopulse the way it read.

I believe No. 45 may just be a jump to the input side of the Autopulse switch as per attached diagram. With that arrangement one cannot run the Autopulse without having the ignition switch on. This would be a good safety feature. One can still start the engine without having to run the Autopulse, a valuable feature when not needed. It sounds very simple and perhaps that is all it was.

I agree that it was meant to ensure that the pump was only intended to be operated with the IG on. The wiring could also have been a peculiarity of Positive Ground wiring, although that shouldn't be an issue unless the pump body grounds out.