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Old 10-18-2005, 07:09 PM
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how to test ford ignition

Ok i need to know how to test the ignition system on my 73 mustang with 351C motor. I think my coil is going out on my because i took the coil wire off the distributor and cranked it and saw two blue sparks jump to metal but then they sparks turned to orange and stayed orange. The coil is losing power correct? how do i determine its the coil for sure? the car runs...but poorly and the timing jumps around also. Is this a big ignition system fix or what? thanks for any advice

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Old 10-19-2005, 03:27 AM
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Doc here,

This testing procedure is valid for just about any automotive coil. Using an ohmmeter, check the resistance between the side terminals of the coil. Do this with all of the wires to the coil disconnected.

You should see 0.75 to 0.81 ohm of resistance. Then check the resistance between either side terminal and the center high tension terminal. The reading should be 10,000 to 11,000 ohms. Any significant deviation from these numbers would indicate that the coil is defective.

73 Mustang STOCK Ignition Diagram...

The left is a V6 the right is a V8...If the coil checks good you may have Governor issues..

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Old 10-19-2005, 05:42 PM
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Try cleaning the coil with electrical contact cleaner. Make sure it is NON RESIDUE type. The spark jumping usually indicated the coil is putting out OK power. It just needs to go to the plugs.

Inspect the cable tower for cracks. If you have any cracks or deteration, get a new coil.

Get some Silicone for ignitions. All auto parts stores have it. Use a Q-Tip and wipe some on the inside of the wire boot.

Do this to both ends of your wires. This helps water seal and electrical seal the connections.
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