Points keep burning up
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Freshman User
Joined: Jan 2014
Posts: 40
Likes: 0
Points keep burning up
okay so i have a 1977 f250 with the stock 400. the truck has been switched over to points from the original electronic ignition. so i have put 1500 miles on the truck and burnt through 3 sets of points and condensors already. what might cause this? the coil is getting 12-13 volts all the time but the coil is a "non external resistor required". any ideas? Also, i have been thinking of switching over to an aftermarket electronic ignition. Possible pertronix ignitor 2. Has anybody tried this? thanks, dave!
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
Agree with the others; despite what your coil may be rated to handle, stock points are not rated for full voltage. Other things that can burn through points are too fine of gap, misalignment, or a bad condenser, but a bad condenser is usually accompanied by strong misfire.
What gap are you running?
What gap are you running?
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
The truck should already have a resistor, this:
D7AZ-12250-A .. Resistor Wire-Ignition Coil (Motorcraft DY-213).
49" long / Color coded red / 1.30-1.40 ohms resistance / #16 gauge wire.
1977/89 F100/350, Bronco & Econoline.
D7AZ-12250-A .. Resistor Wire-Ignition Coil (Motorcraft DY-213).
49" long / Color coded red / 1.30-1.40 ohms resistance / #16 gauge wire.
1977/89 F100/350, Bronco & Econoline.
More Turbo
Joined: May 2007
Posts: 622
Likes: 2
From: Phoenix, AZ
If his truck had electronic ignition on it would it still have resistor wire on it?
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
Yes, there is still a resistor circuit.
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Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
The resistor wire I posted was introduced in 1977.
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Brett Foote
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
COLF-12250-A .. Resistor Wire-Ignition Coil (Motorcraft DY-37).
61.49" long / Color coded pink / 1.30-1.40 ohms resistance / #20 gauge wire / All 1960/70 FoMoCo vehicles, some 1971/76's.
D1AZ-12250-A .. Resistor Wire-Ignition Coil (Motorcraft DY-84-A).
60" long / Color coded red with green stripes / 1.30-1.40 ohms resistance / #16 gauge wire / Some 1971/76 FoMoCo vehicles.
Cargo Master
Joined: Apr 2009
Posts: 3,038
Likes: 4
From: South west Idaho
You should be able to just add in a resister out next to the coil i would think, the experts here can tell you for sure.