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Re: ford 4000 o gas no start but runs great otherwise


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Posted by Deutz Lover on December 04, 2017 at 19:02:01 from (174.218.7.61):

In Reply to: ford 4000 o gas no start but runs great otherwise posted by 4acrefarm on December 03, 2017 at 13:26:53:

Quoting Removed, click Modern View to see

I realized I might have been confusing, but can't edit or add to those posts---a slight pita.

In step 2. the objective is to operate the points manually. You will get a small spark at the points when they open. You should get a 10-15,000 volt spark out of the high tension lead coming out of the coil wire,

I should have told you to remove the high voltage lead from the distributor cap and rest it about 1/4" near whatever ground you can find on the block so that any spark from the coil will travel from the lead to ground just as it would jump across the appropriate spark plug/s if the rotor and cap were in place. You might also hear a pop as it jumps or somewhere if there is a short. It is also helpful if you do it in the dark as you were already doing. It is Christmas and you may get some lights. lol

You should have 12 volts going into the coil even if there is a current limiting resistor.

Measure the coil resistance with both lug wires removed and high voltage lead removed. There should be 10,000 ohms or greater resistance between the + terminal and the high voltage output on the coil. This is where there are a lot of windings of very fine wire. The primary winding is another story.

Measure the primary winding resistance from the distributor side of the coil and the coil case. It may or not be grounded. Normally you should get a resistance of about 0.75-2 ohms when measuring across the two small lugs.That is why a coil will get hot if the ignition is left on without cranking. The windings ratio is about 100:1, but naturally the primary windings have far fewer turns and are greater in diameter to carry the current.

I assume you are using a digital ohm meter. Be sure of the resistance range settings and be sure to short your meter leads first before testing each resistance range because some of these meters are flaky on different ohms settings. It is impossible to get a zero ohms reading on my cheap Centech meter at the lowest range.(.1-199 ohms) It usually runs .4-1 ohm with the leads crossed so be aware of that if your meter is a low end job.

That is all I have for now


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