ignition coil
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
Sounds like a previous owner redid the wiring. If this is the stock coil, you need to drop it down to 7-9 volts. The way this is done in the stock wiring is with a resistive wire that drops the voltage down. The primary winding of a stock ignition coil is on the order of 1 ohm, so it takes about 0.8 ohms in series upstream of the coil power to get you close to 8 volts. You can find a stock wiring harness in a junkyard, or even easier would be to get a stand-alone automotive grade resistor from a parts store. Old Chryslers used this setup and it's the easiest to retro-fit when a previous owner doesn't know what he's doing and thinks he can do a better job at wiring a vehicle. This is all assuming you are running the stock coil. Some performance aftermarket coils do take the full battery voltage.
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Joined: Mar 2008
Posts: 8
Likes: 0
Sounds like a previous owner redid the wiring. If this is the stock coil, you need to drop it down to 7-9 volts. The way this is done in the stock wiring is with a resistive wire that drops the voltage down. The primary winding of a stock ignition coil is on the order of 1 ohm, so it takes about 0.8 ohms in series upstream of the coil power to get you close to 8 volts. You can find a stock wiring harness in a junkyard, or even easier would be to get a stand-alone automotive grade resistor from a parts store. Old Chryslers used this setup and it's the easiest to retro-fit when a previous owner doesn't know what he's doing and thinks he can do a better job at wiring a vehicle. This is all assuming you are running the stock coil. Some performance aftermarket coils do take the full battery voltage.
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TexasGuy001
1987 - 1996 F150 & Larger F-Series Trucks
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Oct 19, 2010 02:49 AM
