76 6 cyl Ignition Problem
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76 6 cyl Ignition Problem
Say I have a 76 F250 6 cyl and I have a little problem. When I turn the ignition switch on and off I get a spark. When I crank the engine I get no spark. The distributor does turn. If I leave the key on and unplug and plug the pickup connector I get spark. So does anyone think the pickup may be bad? Any help would be great.
Thanks
Lee
Thanks
Lee
Last edited by fdilley; Apr 9, 2006 at 10:11 PM.
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I'll Give it a try
I'll try the remote. I measured the ignition switch contacts in both run and start postitions, and they seemed to be fine.
Thanks
Lee
Thanks
Lee
Last edited by fdilley; Apr 9, 2006 at 11:01 PM.
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Check the two wires on the starter relay (solenoid) mounted on the firewall near the battery. There should be two wires which plug in to the front of the solenoid, the terminal face the engine. Make sure they are both plugged in. One wire (I think is brown??) the wire which goes to the terminal marked "S" on starter relay give power to the relay when the key is in the "START" position and engages the starter motor. And the terminal marked "I" gives power to the ignition module and helps to power up the coil for spark while the key is in the "START" position .
Last edited by 1975Ford; Apr 10, 2006 at 11:14 AM.
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Posting Legend
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You can find ignition schematics here:
User BB's Duraspark diagrams:
https://www.ford-trucks.com/forums/member.php?u=1811
User BB's Duraspark diagrams:
https://www.ford-trucks.com/forums/member.php?u=1811
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Thanks
Thanks Buck, I'll let you all know what I find. The truck is about 35 miles away and I can only get there on the weekends. But I'll write again and tell the story. I know after I get it home I have the breaks to do, the muffler, the driver's window and throw-out bearing and who knows what else. But project cars and trucks are that way.
Thanks much
Lee
Thanks much
Lee
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Starter Relay
I pulled the distributor today to replace the pickup and I noticed that I also have the 2nd post on the relay that has a brown wire on it. Thw relay is new and when the key is in the start postion there is 12volts on the second post, but still no spark. Anyhow I'll replace the pickup and see what happens. Maybe tomarrow I'll have the thing running or will start tracing the wireing out. I guess it's time to find a book on the truck.
Thanks for all the help,
Lee
Thanks for all the help,
Lee
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Please mention terminals by I or S.
S is the start terminal (engine crank)
&
I is the 12 volts to goil Ignition terminal.
Here's another schematic.
http://www.billwrigley.com/vintage/308.jpg
S is the start terminal (engine crank)
&
I is the 12 volts to goil Ignition terminal.
Here's another schematic.
http://www.billwrigley.com/vintage/308.jpg
Last edited by Mil1ion; Apr 14, 2006 at 10:40 PM.
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Schematic
Mil1ion, thanks for the schematic. When in the start position on the ignition switch, both the "S" and "I" has 12volts on them. I know that the ignition switch supplys the 12volts to the "S" terimal and that the "I" terimal is an output to the coil to bypass the current reduction resistor. What I don't know is if the "I" output (brown wire) is hooked up to anything. Someone else has done some mod's to the wiring. I measured the resistance on the old pickup and found it was around 2meg ohm (way too high). The new pickup measured around 600 ohms. If I move the wires on the old pickup I can get a reading around 800 ohms. So I think it must be bad. I have the distributor all back to gather (what a pain). Anyhow I want to thank you again for the schematic, and when the sun comes up I'll try again.
Lee
Lee