Not too 'heavy' on war'in butt.....how bout off the alternator?
6sal6

Rufus68 wrote:

6sally6 wrote:

Not too 'heavy' on war'in butt.....how bout off the alternator?
6sal6

The alternator is where I took my relay trigger wire for my electric choke.  I only want the electric choke powered if the motor is actually running.

I have a 3G alternator installed. Do you have a stock alternator with an external regulator?

I made a schematic (not a wire diagram) for the 66 and found no RUN only contact in the car. Using the stator as mentioned above is a good idea if you only what it on when the engine is turning.
I've never measured a 3G, but I did measure the voltage on my 1G alternator with a scope and found a sawtooth wave with a mean of 6.8v. It required the use of a 6v relay- something like a Potter & Brumfield 1432873-1 relay, which has a 6v coil and 40 amp contacts, and you could drive your 12v relays from that. If you want the schematic follow this link and help yourself to any of the information there: https://drive.google.com/drive/folders/10FqYlsGT1XXr8B5TCF9WAASkU4vdPtuJ?usp=sharing
 

KeithP wrote:

With the new engine I am getting from BluePrint Engines it has the CVF serpentine setup. I looked at the CVF kit online and it comes a 1 wire alternator. There are no other connections to the alternator. 

Some of the classic Mustangs use an oil pressure light- the sender senses oil pressure and closes a switch. It would require adding a second sender (I assume), and if you are so inclined. Since the switch ratings aren't known I would probably use the sender to drive a relay and use that to trigger the other relays if you are worried about the load on the sender.
Edit, I found a post by Woodchuck on another forum where he says to use a "dual port oil pressure extension". Scott Drake makes these among others. The switch he recommends is AC Delco D1811 oil pressure switch.
In another post I found a guy that used a three terminal switch (SPDT) used on a 74 Chevy Vega- oil pressure switch, which he called part number AC 61809. I found it in a search for 74 Vega oil pressure switch but it didn't have that part number, although it was three terminal, so it had common, NO, and NC. The vega part was used in a 7.5A circuit and the D1811 was used to run an electric choke, so either of these should be able to power your relays directly.
 

Last edited by Mach1Driver (3/28/2023 5:58 PM)

KeithP wrote:

This is getting way too complicated. I see that Ford has 'ON" on the ignition bezel. I will now use 'ON' instead of 'Run'. I will probably just wire the proposed relays to the 'ON/ACC' trigger. God or Ford intended it that way, so who am I to change that?

Agreed, in the future just be careful what you ask for ;)