ballast resistor
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Senior User
Joined: Oct 2006
Posts: 217
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From: north battleford
ballast resistor
hi. i'm replacing my coil with a msd 8205 coil.has the same hookups etc.the general instructions say to put in a .8 ohm ballast resistor but on the msd site it says the resistor is for points ignition.my 86 f150 5.8 has the duraspark(blue module).a buddy told be the truck may have a loom resistor already inline???do i need the .8 ohm resistor???
any help appreciated.thanks in advance,
andy
any help appreciated.thanks in advance,
andy
Cargo Master
Joined: Mar 2008
Posts: 2,564
Likes: 207
From: Washington
My 1986 F-150 had a “resistor wire” between the key switch and the 4 pin plug on the left fender well, near the duraspark ignition module. The duraspark ignition needs to uses a ballast resistor or resistor wire for the round coil.
To confirm that your current coil is using a reduced voltage, compare the voltage of the battery positive with the coil positive with the truck running at idle. If your current system is using a resistor wire to power the coil, the coil voltage will be lower than the battery voltage and then you won’t need the ballast .8 ohm ballast resistor.
More info here.
https://www.ford-trucks.com/forums/7...-150-woes.html
Jim
To confirm that your current coil is using a reduced voltage, compare the voltage of the battery positive with the coil positive with the truck running at idle. If your current system is using a resistor wire to power the coil, the coil voltage will be lower than the battery voltage and then you won’t need the ballast .8 ohm ballast resistor.
More info here.
https://www.ford-trucks.com/forums/7...-150-woes.html
Jim
Posting Guru
Joined: Jun 2004
Posts: 1,635
Likes: 0
From: Niceville, FL.
The resistance wire in the wire loom is 1.1 Ohms which may be a little high for your coils voltage requirement. It should work OK but may not provide the maximum performance you'd get with the manufacturers recommended 0.8 Ohms.
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