Re: [ihc] Coil Voltage?

[John Hofstetter <hofs@xxxxxxxxxxxx>]

on 3/20/04 1:29 PM, George B Humphrey at xgbhx@domain.elided wrote:

> Dan,
> I like the way you are thinking. I tested the coil to ground today and
> the voltage was a little over 5v. That would help support your theory. I
> did the remote solenoid setup awhile ago. It is possible I got my wires
> mixed up. I have both the large blue wire to the alternator and the green
> wire that goes to, I believe, the ammeter on the battery side of the
> remote solenoid. 

That should be correct.

> I tested it and the wire that runs to the positive side
> of the coil is hooked up to the solenoid on the starter. It is connected
> to the bottom terminal of the solenoid. I believe that is the R term,
> correct? 

The S terminal (start) is on top of the Delco solenoid. It should have full
voltage coming out to the coil during starting. That wire is the one that
you should have cut when installing the Ford solenoid. The end coming from
the ignition goes to the S terminal on the Ford and the other end is
connected to the big terminal coming out of the Ford.

> It is impossible to see in there. Is there an easy way for me to
> test my setup to see if the right circuit is starting the engine? I've
> been thinking about getting a new harness for that section. Some P.O.
> splicing and wires going nowhere. I also wish IH had used other colors
> beside green in their wiring. Variety is the spice of life, you know.

Where is the ECU picking up its power? Good power source? I can't emphasize
enough that an overwhelming majority of the problems with the Pro-jection is
caused by poor grounds.

As I remember, the ECU supplies the power to the fast idle solenoid, and to
the fuel pump, so it seems obvious that the ignition switch triggers the
power supply relay, and once that relay switch is closed, then power
directly from the battery is going to the ECU and thence to the fuel pump.

Bill Thebert took the wire that supplies power to the fuel pump, and used it
to trigger another relay which then sent power directly to the fuel pump. He
believes that it gave him better fuel supply, but I haven't done that, and a
lack of fuel is no problem for me.

Because I have the MSD ignition which is happy with almost any voltage, I
picked up my power to the coil from some source that is always on in either
run or start mode and I then use the + terminal on the coil to trigger a
relay that then supplies power to everything that needs to be key
controlled. Unfortunately, I can't remember where I picked up that circuit
to run it to the coil. I can look in the next day or two, if that would be
helpful. 

Some other digester probably knows off the top of his head what is always
hot in either start or run mode. Besides the + terminal of the coil in the
factory wiring.

John Hofstetter


> 
> 
> On Sat, 20 Mar 2004 08:27:19 -0500 (Eastern Standard Time) "Dan Nees"
> <cookiedan@domain.elided> writes:
>> George, >    You have a 72 Scout II. They were originally points
> equippedwith 
>> a run
>> and start circuit from the starter. The start circuit would have
>> been a full
>> 14.4 volts from the battery, the run circuit would have run through
>> a
>> ballast resistor. If the relay is not closing at start-up perhaps
>> the start
>> circuit hase been removed and you only have the run circuit trying
>> to start
>> the truck. This would, perhaps not be applying enough voltage at
>> start-up
>> for the relay. Maybe the resistor circuit wire and the run wire were
>> put
>> back on the wrong terminals on the solinoid by accident and you are
>> getting
>> your 12-14 volts at run, but; only 5 or so at start-up.
> 
> 
> 
> 
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