Wiring diagram
Moderator
Joined: Jan 2001
Posts: 57,025
Likes: 2,756
From: Virginia
The offiicial factory one can be bought at www.helminc.com. A freebee with just the highlights can be seen at
http://www.autozone.com/servlet/UiBr...3d800a3a41.jsp
http://www.autozone.com/servlet/UiBr...3d800a3a41.jsp
Thread Starter
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Senior User
Joined: Nov 2005
Posts: 319
Likes: 2
Need help diagnosing the friggin truck. Need a TFI ignition guru.
Have a no start problem on a 89 F250 302. No spark at coil. Coil impedance reads ok. Replaced TFI module. Witch key on, voltage reads 12v at module plug terminal H4, but only 4.4v at pin H5. It is my understanding that this should also read 12v. Grounding H5 does not produce a spark at the coil. With the key off, H5 ohms out at 700. I am trying to find a wiring diagram to trace back the H5 wire, but to no avail. I'm not even sure I am on the right track here, but this is the only deviation I have found. Any help or comments would be apreciated. Otherwise, I will burn the truck and collect the insurance. (just kidding)
Moderator
Joined: Jan 2001
Posts: 57,025
Likes: 2,756
From: Virginia
Do you have any codes? The computer may see a signal that is missing.
Here's some more info. Possibly the pip sensor inside the dist is bad?
http://www.autozone.com/servlet/UiBr...3d800a185f.jsp
Here's some more info. Possibly the pip sensor inside the dist is bad?
http://www.autozone.com/servlet/UiBr...3d800a185f.jsp
