Chevrolet switch plate - last version with 6 switches

[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.

[Jacques Reed]

Hi Tony,

I have attached a photo of a NOS wiring harness with No. 46 Autopulse wire included. All wires have been traced and marked and there is no No. 45 leading to the starter solenoid area. No wires appear to have been cut off or removed from the harness.

According to Parts List it is *C29QF 14403- Wiring Assembly- Horn (used with new design cab)
It terminates near the starter solenoid so a short tail would all that would be required to connect it to the Autopulse.

This is what has thrown me that the wiring diagram list of wires infers two wires to the Autopulse.

My apologies, Phil, for hijacking this thread but hope it is of interest. Perhaps Hanno can migrate it to the Snakes Alive thread.

Cheers