Question about Ford F-250

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How do you wire up a coil when the wires to the old one have been cut and are no longer there?

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There are not a lot of wires to a coil.
There normally is a power wire from the ignition switch (or ECU relay) to the + side of the coil.
Then there is the switching side that goes to ground, through either the distributor points on an older car, or an ECU on a newer one.
This ground side can also have a tach lead and a condenser wire.

Posted on Sep 04, 2010

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Positive side of the coil should be connected to the wire from the ignition switch, negative side of coil goes to the points set. (joined with condenser). Disconnect any external condenser attached to the coil and run it as I just stated. Pay attention to coil polarity (they are marked). If it runs OK that way, then re-attach the tach. If the problem returns, the tach is bad. A coil that's been overheated may become internally shorted so I'd use a different one and then after it's running correctly, you could put the old one back just to see if it's still good. if it is, save it as an on-board spare. I'd also check the alternator charge rate. If it's putting out too much (over 13.9) it will also damage the coil. On boats, there is little air flow in the engine compartment even with a bilge blower running. On all the boats I've had, I always mounted the coil on an adjacent wall and used a longer center (high tension) wire. Coils really don't like getting hot and that helps a lot in keeping them working.

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