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Old 12-03-2005, 17:01   #1 (permalink)
anoldfart2@unlisted.com
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Resistor wire on 79 F150

Where's the Resistor wire on 79 F150 400 engine?
I think I may have a open wire in it. Truck will run then suddenly
die. Bypassing directly from coil to battery gets it running again.
But where the heck is that resistor or "resistor wire" is how my
repair info refers to it. OF course they cant explain where it is...

Thanks

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Old 12-03-2005, 17:01   #2 (permalink)
Rick
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Re: Resistor wire on 79 F150


<anoldfart2@unlisted.com> wrote in message
news:bdb4p19o0g07kt97docv253lfhl6s26189@4ax.com...
> Where's the Resistor wire on 79 F150 400 engine?
> I think I may have a open wire in it. Truck will run then suddenly
> die. Bypassing directly from coil to battery gets it running again.
> But where the heck is that resistor or "resistor wire" is how my
> repair info refers to it. OF course they cant explain where it

is...
>
> Thanks



It's a wire of the correct resistance right in the harness. Can't
remember the color, maybe pink, but it's marked...


It's connected to the ignition switch but may pass through a connector
or two on the way...



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Old 12-03-2005, 17:01   #3 (permalink)
Backyard Mechanic
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Re: Resistor wire on 79 F150

anoldfart2@unlisted.com wrote:

> Where's the Resistor wire on 79 F150 400 engine?
> I think I may have a open wire in it. Truck will run then suddenly
> die. Bypassing directly from coil to battery gets it running again.
> But where the heck is that resistor or "resistor wire" is how my
> repair info refers to it. OF course they cant explain where it is...


IIRC, the 'resistor' wire is like the fuse-links, a 'spliced-in' wire
with different insulation AND a different feel and flexibility... and can
be found by following positive side wire back from coil terminal.

As it must dissipate heat, it shouldnt be wrapped into the harness.

Dont rule out a faulty ignition switch, as that occurs much more often.

Also try forum on

ford-trucks.com

--
Yeh, I'm a Krusty old Geezer, putting up with my 'smartass' is the price
you pay..DEAL with it!
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Old 12-03-2005, 17:01   #4 (permalink)
Jim Warman
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Re: Resistor wire on 79 F150

I recall there being a resistor wire on the older vehicles with breaker
point ignition.... it was buried in the harness along the fire wall. IIRC,
it was identifiable by its fabric jacket. I don't recall such a wire on
DuraSpark 2 systems... if memory serves correct, the module contains a
current limiter for the coil - I've been mistaken before and this may be no
exception....

The fender mounted modules were the biggest concern with these systems. They
would die but could be brought back to life by pouring cold water on the
module.

FWIW... open wires in a 12 volt system are rarely "self healing". Corroded
connections usualy get to the point where their current handling
capabilities wont allow the load to power up.

Rather than "think" you have a particular concern, you could use a test
light (in this case the test light is the most appropriate tool) to verify
power to the coil. A little testing takes away most of the guesswork and
allows us to perform a timely and, hopefully, economical repair.


<anoldfart2@unlisted.com> wrote in message
news:bdb4p19o0g07kt97docv253lfhl6s26189@4ax.com...
> Where's the Resistor wire on 79 F150 400 engine?
> I think I may have a open wire in it. Truck will run then suddenly
> die. Bypassing directly from coil to battery gets it running again.
> But where the heck is that resistor or "resistor wire" is how my
> repair info refers to it. OF course they cant explain where it is...
>
> Thanks
>



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Old 12-03-2005, 17:01   #5 (permalink)
Rick
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Posts: n/a
Re: Resistor wire on 79 F150


<anoldfart2@unlisted.com> wrote in message
news:bdb4p19o0g07kt97docv253lfhl6s26189@4ax.com...
> Where's the Resistor wire on 79 F150 400 engine?
> I think I may have a open wire in it. Truck will run then suddenly
> die. Bypassing directly from coil to battery gets it running again.
> But where the heck is that resistor or "resistor wire" is how my
> repair info refers to it. OF course they cant explain where it

is...
>
> Thanks



By the way, the resistance is 1.1 ohms for that vehicle....


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Old 12-03-2005, 17:01   #6 (permalink)
Rick
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Re: Resistor wire on 79 F150


"Rick" <notta@goodone.com> wrote in message
news:6Gqkf.9358$wf.8172@newsread3.news.atl.earthlink.net...
>
> <anoldfart2@unlisted.com> wrote in message
> news:bdb4p19o0g07kt97docv253lfhl6s26189@4ax.com...
> > Where's the Resistor wire on 79 F150 400 engine?
> > I think I may have a open wire in it. Truck will run then

suddenly
> > die. Bypassing directly from coil to battery gets it running

again.
> > But where the heck is that resistor or "resistor wire" is how my
> > repair info refers to it. OF course they cant explain where it

> is...
> >
> > Thanks

>
>
> It's a wire of the correct resistance right in the harness. Can't
> remember the color, maybe pink, but it's marked...
>


Think it's red/light green...

>
> It's connected to the ignition switch but may pass through a

connector
> or two on the way...
>
>
>



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