going thru FMC400's choke thread https://www.ford-trucks.com/forums/8...-answered.html, it brought up a question and a suggestion to start a new thread. if the output on the stator is still AC, will it cause "noise" in the system? I am going to convert the holley to all-electric instead of the electric-assist and made a statement about not using the factory blk/wh wire because of the AC voltage? if ok, would it need to be grounded or will the factory design work if I use the factory choke cover and the conversions bimetal spring? this is a '76 F250 390 4v C6

 

Just get a manual choke, this way YOU control it, not the motor..... you need it, choke it......... you don't, let off...

Auto chokes are for wussies.... take control.

 

my wife occasionally drives it

 

Oh, i'm not your guy then

Auto guys will chime in....I think

 

One of my cars don't even have a choke plate in it. I just pump the gas pedal 6 time turn to start and it fires right up. This is on my street rod with a 350 chevy , so a my ford might not do it L.O.L.

 

Holley chokes are grounded back to the carb , why can;t you use the original hot choke wire ?

 

The term "noise" by itself is somewhat vague, but if the question is, can powering an electric choke off the stator of the alternator cause any sort of undesired behavior in other electrical loads on the truck because of electromagnetic coupling, the answer is no. The electrical systems in these trucks are extremely simple, and any switching that occurs is at a relatively low frequency. The only sensitive component is the radio. The radio is susceptible to audio-band interference from the following two sources:

1) The slow-switching instrument-cluster voltage regulator (ICVR). In cases where its switching is expected to be a problem, a suppression choke (different kind of choke this time) is placed upstream of the ICVR. This is rather rare; I've never actually seen one. The factory wiring diagrams simply allude to its existence.

2) The faster-switching primary winding of the ignition coil. To protect from this switching noise showing up on the radio power supply (and being audible through the speakers), almost all trucks have a bypass capacitor tied off the primary winding of the ignition coil, or the sense input of the voltage regulator. In practice, modern radios and head units have enough bypass capacitance inside that these external capacitors are no longer necessary.

Most aftermarket electric chokes call for 12 volts, so that's what I recommend. It's possible the RMS content of the alternator stator signal is enough to get the job done, but I personally haven't tried it. Since the manufacturer calls for a full 12 volts and it's just as easy to use that signal instead, that's what I did on my truck, that's what I believe others here to have done, and that's what I recommend. If you'd like to try to use the stator, the only possible problem you might run into is slower opening time. However, that's easily compensated for by adjusting the cap's index. But definitely no issues with "noise" in general.

 

ok, thanks. as I plan and replan my modification and resto projects, I try for ease of service and neatness to be a higher priority than the PO's add-ons and repairs