Substitute for original coil

[Lriwater]

Hello,
I have done a good amount of searching with no luck. Looking for a part number for the ignition coil for the stock ignition setup with no electronic ignition. I do have the Helmar distributor. Just can't seem to get a spark, and the coil is the only thing left that I haven't replaced. Is there a compatible coil that I could get at NAPA or another auto parts store?
Thanks in advance,
Chuck

[Esteban]

Any regular coil will work. The Patrol doesn’t use a resistor so that’s about the only thing you have to be aware.

If the only coil available uses a resistor, you’ll have to install it as well.

[Peter60]

Esteban
Are you saying that a resistor is not needed on the distributor or is it some other resistor not needed?

[Esteban]

Esteban
Are you saying that a resistor is not needed on the distributor or is it some other resistor not needed?

The coil in the Patrol doesn't require a resistor. But that means that you have to look for the appropriate coil, one that was designed to work without a resistor. EDIT: The Parts manual, 1980 final edition, does mention a "cold region coil" with a ballast or resistor. I personally had never seen one in a Patrol.

In engines that use a coil with a resistor, normally the resistor is bypassed when the engine is being cranked, so full amperage is delivered to the coil and spark plugs. Once you release the key from the crank position, current flows through the ballast or resistor to the normal amperage required for the coil to work.

If the only coil you can find is of a design that uses a ballast or resistor, you must install it (goes in series to the coil) otherwise too much current will flow through the points and pitting will develop sooner, and possibly the coil won't last due to overheating.

Toyota's use a resistor in their design. Maybe to overcome spark plug fouling at startup since they consume more oil normally than the Patrol engine does.

Jokes aside, I found this info:

http://classicmini.weebly.com/choosing-a-coil.html
Ballasted ignition systems were designed to accommodate a wide range of operating conditions. A 3 ohm coil can only produce it's power when it is being supplied the necessary 12 volts. This means that in cold cranking situations when the batteries voltage dropped, the coil wasn't receiving enough power to create a spark.

On the flip side, there is the 1.5 ohm coil which is happy to operate in these lower voltage scenarios. Unfortuantely, they would burn out quickly if operated constantly at 12 volts. The solution to this problem was the ballast which reduces the voltage down to the 6-9 volts the 1.5 ohm coil prefers. It isn't, however, just that simple. In order to maximize the coil's output during starting, ballasted ignitions have a ballast bypass which sends 12 volts directly to the coil during startup. This doesn't create any issues for the ballast because the jump wire now creates 12 volts on both sides of the resistor. There is no longer a current flow, so the resistor doesn't do anything.

And a couple of options of coils for the Patrol:

Standard Motor Products UC15T Ignition Coil

Some forklift parts will have coil for a Komatsu: KO22433-14816 (22433-14816 is the Patrol number actually)