A coil is just a transformer. It steps up voltage from what you have(12V) to
what you want(up to 40000) The coil resistance doesn't mean much, the spec is
for trouble shooting the coil. Although
the coil resistance is related to coil voltage, it is not a direct
relationship. Thinner or longer coil windings give more resistance. Primary
coil(less windings) induces a current in secondary coil(more windings). The
ratio beween the number of times wire wraps around each coil(windings)
is the ratio of volts in/ volts out. For example, 10 turns on pri,10000 turns
on sec, or 1:1000,
will change 12 volts to 12000 volts. But it will also reduce amperage by same
factor.
The whole idea is to make enough voltage to make a spark.
Dr. Pat
----------
>From: HKUSP40578@aol.com
>To: dakota-truck@buffnet.net
>Subject: Re: DML: Wimpy stock coil(HELP!)
>Date: Mon, Jan 18, 1999, 4:40 AM
>
>By the way...I was looking in my manual I am was curious about what it listed
>under the ignition chapter:
>Ignition Coil Resistence:
>*Primary
> 87-90..................1.34-1.55 ohms
> 91 and later..........05-1.2 ohms
>
>*Secondary
> Prestolite Coil.......9,400-11,700 ohms
> Essex Coil............9,000-12,500 ohms
> Diamond Coil
> 87-90..............15,000-19,000 ohms
> 91...................15,000-19,000 ohms
> 92 and later.....11,300-15,300 ohms
> Toyodenso Coil
> 92 and later....11,300-13,000
>
>What does it mean or what is the difference between primary and secondary?
>What kind of coil would I have in my 93 Dakota V6 4x4 or how would I find this
>out, since there is a choice of 4? I am just trying to figure this whole coil
>language/terminology out before I buy an aftermarket coil! THANKS ALOT!!!!
>
>Kyle
>93 Dakota 4x4 V6
>99,600 miles
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