TFI Module
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I am trying to wire my new wiring harness (the black TFI module) and convert it to a gray TFI module harness. In looking at the attached diagram, I started by removing pin 3 from the TFI connector and put in the resistor, I then spliced (soldered) it in with pin 5 from the same TFI connector.
Then I look at pin 3 (which is now empty) and according to the diagram I need to put a "+12v start only" in that spot. In the Chilton manual it shows that wire, pin 3 for a gray TFI module, as going to the starter relay. I have another wiring harness that was originally wired for a gray module that I can't use but I can see where the wires go. If I follow pin 3 from the TFI connector on this harness, it goes to the starter relay. It just doesn't seem to me that information I have is matching up.
My questions are:
For a gray TFI harness, where should pin 3 of the TFI connector go to?
Starter relay or somewhere else?
The wire to the starter relay mentioned in the Chilton manual is the smallest of the 3 wires on the relay, I thought this was input from when the key is turned and not an output signal.
Thanks.
Then I look at pin 3 (which is now empty) and according to the diagram I need to put a "+12v start only" in that spot. In the Chilton manual it shows that wire, pin 3 for a gray TFI module, as going to the starter relay. I have another wiring harness that was originally wired for a gray module that I can't use but I can see where the wires go. If I follow pin 3 from the TFI connector on this harness, it goes to the starter relay. It just doesn't seem to me that information I have is matching up.
My questions are:
For a gray TFI harness, where should pin 3 of the TFI connector go to?
Starter relay or somewhere else?
The wire to the starter relay mentioned in the Chilton manual is the smallest of the 3 wires on the relay, I thought this was input from when the key is turned and not an output signal.
Thanks.
Cargo Master
Joined: Apr 2003
Posts: 3,476
Likes: 224
From: Frequently frozen MN
Great tfi article. Glad that the OP gpt his question answered.
Thought I'd add my .02 on aftermarket tfis -- I have read that -- at least originally -- many of them did not adjust the dwell as described for the gray oem version. This led to numerous problems, so they got a bad rep. And they deserved it. Probably not the case any more
hj
Thought I'd add my .02 on aftermarket tfis -- I have read that -- at least originally -- many of them did not adjust the dwell as described for the gray oem version. This led to numerous problems, so they got a bad rep. And they deserved it. Probably not the case any more
hj
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
You may have to replace the starter relay with and older starter solenoid as it sounds like you have a starter relay with out the "I" post.
The wire from the key goes to the "S" post.
OR you can splice it in like Ford did on the 199?-1993 Trucks as in the diagram below.
199?-1993 TFI Start wire:
/
The wire from the key goes to the "S" post.
OR you can splice it in like Ford did on the 199?-1993 Trucks as in the diagram below.
199?-1993 TFI Start wire:
/
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Posting Guru
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You may have to replace the starter relay with and older starter solenoid as it sounds like you have a starter relay with out the "I" post.
The wire from the key goes to the "S" post.
OR you can splice it in like Ford did on the 199?-1993 Trucks as in the diagram below.
199?-1993 TFI Start wire:
/
The wire from the key goes to the "S" post.
OR you can splice it in like Ford did on the 199?-1993 Trucks as in the diagram below.
199?-1993 TFI Start wire:
/
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
I do not know why anyone would cut the "I" post off if they were not using it. Most late model ones do not come with the "I" post as it was used to give full power to the Ignition coil during cranking on older engines. It was also used to bypass the fuel relays on older 460 engines during cranking.
I would splice into the wire going to the "S" post and run that wire to the TIF module.
I would splice into the wire going to the "S" post and run that wire to the TIF module.
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