TFI to duraspark conversion
Post Fiend
Joined: Jul 2004
Posts: 8,786
Likes: 28
From: Northern California
Some 1987 and all 1988 and later do not have the Duraspark II connections because by then, most of these engines were all EFI / TFI-IV anyway.
1986 and before there were still engines that were carbed with Duraspark II, and some that were Carbed with TFI-IV and some that were EFI. This is why the 90% of the trucks main harnesses were wired for both systems. You just need the correct harness extention to plug into the main harness.
1986 and before there were still engines that were carbed with Duraspark II, and some that were Carbed with TFI-IV and some that were EFI. This is why the 90% of the trucks main harnesses were wired for both systems. You just need the correct harness extention to plug into the main harness.
Cargo Master
Joined: Mar 2008
Posts: 2,569
Likes: 207
From: Washington
Here is a photo of the harness you will need. I sell these on ebay for around $20. On my last trip to the junk yard I did not find any good ones, they are getting harder to find. I tried to send you a PM yesterday but it did not seem to work. Jim
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Cargo Master
Joined: Mar 2008
Posts: 2,569
Likes: 207
From: Washington
Here is a photo of the resistor wire and the starter bypass wire. You want 2 wires in and one wire out.
If you have 3 wires in... you also have a resistor wire bypass wire, this is what is shown in the photo.
Let me know what you find when you unrap the black tape. Jim
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If you have 3 wires in... you also have a resistor wire bypass wire, this is what is shown in the photo.
Let me know what you find when you unrap the black tape. Jim
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New User
Joined: Mar 2010
Posts: 13
Likes: 0
From: Casper,WY
I've got one
Just came in from outside. Unwrapped the tape on the wire bundle coming from the cowl and found a nice big fat red wire. Looks like I'm set as soon as my new wires arrive.
Jim, I've only recently signed up and don't have 25 posts- that's why you can't pm me.
I'll be ordering a new carb from O'Reill*** tomorrow, a Holley 64-1557.
THANK YOU BOTH for your help.
Jim, I've only recently signed up and don't have 25 posts- that's why you can't pm me.
I'll be ordering a new carb from O'Reill*** tomorrow, a Holley 64-1557.
THANK YOU BOTH for your help.
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