saxegotha
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• Crestview, FL, USA |
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• Registered on 10/23/2005 |
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• 12 posts |
• 1
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 Posted:12/10/2005 22:52 |
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Hi. During a radiator swap I decided to change the starter solenoid mounted on the inner fender wall. The wire connected to the " I " terminal is broken at its opposite end. It looks as if the wire has been broken for some time (not a fresh break).
According to what I can see in the 73 shop manual, this wire is supposed to be connected to the ignition coil. However, it does not reach the coil. Upon inspecting the ignition coil it appears to have all its wires in place and intact. On the coil are the following: main coil to distributor spark wire, small black wire from coil to distributor to the distributor, red w/blue stripe wire pressed on which disappears into the wiring harness.
I don't think the red/blue wire connects to the " I " terminal (as that wire is black). The nearest portion of the wiring harness (which also has solenoid associated wires in it) does not have a broken black wire either. I even unrolled electrical tape six inches down the bundle just to make sure.
Question: if this wire is supposed to go to the coil, what is its function? What is the purpose of a connectionf from the " I " terminal of the solenoid to the coil? Noise suppression of the coil?
I do not have a schematic or wiring diagram, only the shop manuals which have no electrical schematics.
Any help would be most appreciated.
Anyone with a website which has a schematic or wiring diagram for a 73 will move to the top of my "all time cool people who helped me keep this thing running" list.
Thanks. |
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saxegotha
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• Crestview, FL, USA |
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• Registered on 10/23/2005 |
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• 12 posts |
• 1
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Posted:12/12/2005 20:06 |
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Never mind. I figured it out. |
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dnevins
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• Subscriber since 12/29/2009 |
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• San Diego, CA, USA |
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• Registered on 12/28/2009 |
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• 228 posts |
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For anyone who lands here with the same broken wire: on the Ford fender-mounted starter relay, the I terminal is live only while the engine is cranking. It sends full battery voltage straight to the coil's positive terminal, bypassing the resistor wire that lowers coil voltage while the engine runs. The point is a stronger spark during cranking, when the starter is pulling battery voltage down.
So it is not noise suppression. With that wire broken, the engine will usually still start and run, and you are most likely to notice it as harder starting in cold weather or with a tired battery. To restore it, run the wire from the I terminal to the coil positive terminal, where the run feed from the ignition switch also lands.
Two diagrams on our site show this circuit. Both are filed under the 1987 to 1991 Bronco, but neither is specific to that truck: one explains the S and I terminals on the Ford 4 terminal starter relay, and the other is a 1973 to 1974 Ford point type ignition circuit.
https://www.supermotors.net/reference/ford/bronco/1987-1991/wiring-diagrams
Dana
https://partslogic.com |
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