Wiring Diagram

[Ganmain Tony]

Hello again chaps,

Wondering if anyone has a copy of the Wiring Diagram for FORD CMPs.

The later dash WITH THE ROUND GAUGES.

Any help appreciated.

[Frantisek Nachlinger]

I think it is in the MB-F1 book, I will look later today.

[Grant Bowker]

If it's the layout of the wires behind the dash you are looking for rather than basic electrical principles an option is to look at Phil Waterman's web site (although he concentrates on Chevs). He's got sketches of the hookup of the wires behind his late HUP dash. If the layout of the gauges and switches is the same ,the layout of the wires also has to be similar (as far as the actual instrument panel is concerned).

[Hanno Spoelstra]

Have you searched this forum? Stuff like shown below can be found here.

[Ganmain Tony]

Thanks Grant and Hanno,

This diagram is for the early civvy dash. The layout for the later dash is different and unfortunately the Chevy ones are different as well.

All help is appreciated though..

[Ganmain Tony]

Jacques Reed,

This man should be in the Dictionary under "attention to detail".

Main issue is the ammeter and how its wired in.

Jacques, if you are around, could you clarify what the relay physically looks like in your diagram?

I take it, it is the starter solenoid?

[Jacques Reed]

Hi Tony,

Yes, should have labelled it the starter solenoid which is what the "relay" is in the diagram.

Battery indicators (Ammeters) always measure current flow through them, as opposed to voltmeters which measure voltages across two terminals so putting the Battery indicator in series in the line is what is required.

The attached photo shows the round gauge panel from which I derived the diagram by tracing out the wires. My original wiring was so jury rigged, as they so often are, that I didn't trust it.

The schematic wiring diagram in the June 1943 Maintenance Manual is a bit misleading to the actual wiring on the panel and the later wiring diagram. It shows the Battery Indicator (ammeter) going directly to Earth. As per my tracing out the wires, and confirming against the Legend on the later wiring diagram that Hanno shows, the Battery indicator goes via the starter relay and the voltage regulator.

Hope this is of some help.

Cheers,

[Jacques Reed]

Hi Tony,

Further to previous post here is a copy of the list of wires shown on top of the later wiring diagram as posted earlier in this thread.

I used these same wire numbers in my wiring diagram.

Hope this is of some help.

Cheers,

[Ganmain Tony]

Invaluable help Jacques, much appreciated,

I will now go and see if I can torch the truck with an electrical fire

Will let you know how I get on.

[Jacques Reed]

Hi Tony,

Glad to help.

Here's hoping it all goes well. One of the reasons I made the diagram is to prevent just that- an electrical fire. This is especially true when I didn't like the grounded Battery indicator in the Maintenance manual schematic. It just didn't seem right. Using the actual later dash wiring and checking against the later diagram and numbers I am 99.99% certain it is correct. Still, in the name of accuracy I am always glad to be corrected if needed.

I have in my notes that there was one exception in practice when I traced the lines. Wire No 21 went from the Circuit breaker to the ignition switch, instead of from the regulator B to the ignition switch. It is the same thing in any event from a circuit point of view. Wire No.37 accomplishes this.

I had a death defying experience 25 years ago when I got my first Blitz off the car carrier at my home (the one with the jury rigged wiring).

No fuel tanks were connected so a 4 Lt fuel can sat beside the engine (uncovered) plumbed into the fuel pump with a hose. I connected the battery and switched on the ignition switch which was dangling loose under the dash and hit the start button. Engine started OK but I soon smelt burning plastic and looked down to see a bit of house wiring glowing red just beside the fuel can. As I couldn't see the loose ignition switch in the dim light I had a quick choice to make: run like hell and watch it, and a few other cars and the truck go up in smoke or rip the wire off to break the connection.

I chose the second and it worked but I had a few burns to the insides of my fingers which took a long time to heal.

Morals of the story: Don't trust 75 year old wiring and especially if it has been dodgied up.

Also: avoid jury rigged fuel tanks. If you want to read a good example of that, read about the 1995 disastrous attempt to salvage a rare B-29 named "Kee Bird" from the Greenland ice. A priceless WW2 aircraft was lost because of just that.

Cheers,

[Keith Webb]

Some NOS pics of wiring from a New Old Stock Ford dash.

[Keith Webb]

Originally Posted by Jacques Reed

Also: avoid jury rigged fuel tanks. If you want to read a good example of that, read about the 1995 disastrous attempt to salvage a rare B-29 named "Kee Bird" from the Greenland ice. A priceless WW2 aircraft was lost because of just that.

Yes indeed, the problem with Kee Bird was a jury rigged fuel tank for the petrol APU which was bounced up and down during a taxi run causing fuel to spill, absolute tragedy as one life had already been sacrificed to get it to that point and all they could do was watch it burn. Such a sad story.

[Euan McDonald]

Originally Posted by Keith Webb

Some NOS pics of wiring from a New Old Stock Ford dash.

The dash Keith pictured could be for sale if someone has lots of cash.
The dash has gauges, speedo wiring and regulator.
Offers considered.

[Private_collector]

Was that loss not because the APU mount fractured and severed a fuel pipe, causing the fire?

[Ganmain Tony]

No electrical fires... but I do have a working amp gauge.

Hooked it up following Jacques wiring diagram and nothing...

Then I thought Id better put in half decent generator after inspecting it, cleaning it, checking the brushes, giving it a quick excite and bench testing it.

Hooked it all back up and gave the engine a little rev and bingo! Amp meter sprang into life.

John Mackie was great help over the phone for regular consults.

Heres the old beast when we first rescued it. Photo is an older one but the truck is roughly in the same condition.

[Jacques Reed]

Hi Tony,

Great to hear it all went well!

And no need for Silvazine burn cream on the fingers!

Cheers,