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I have a question...I have a 1968 ford mustang and I have a no start problem...I replaced the starter silonoid and the starter...and still no start...everything works when I turn the key but that...in the beginning I jumped the silonoid and it started so changed that...then still no start...so replaced the starter...the original starter was bad..I did a bench test and it didn't engage...so now I'm stumped...and I did check the fuses...any advice would be greatly appreciated..
There are two typical conditions: No Start and No Crank. I think you are describing a No Crank situation. If you can get it to crank by making contact between the battery post on the solenoid and the closest post on the front of the solenoid with a screwdriver, then, I think you can limit your problems to the ignition switch, the neutral safety switch (NSS), if it is an automatic, or the wire that delivers the power to engage the solenoid (#32). Is it an automatic?
You'll want to validate that you have 12v on wire #21 (Yellow) at the center of the back of your ignition switch, I think you do, since you say all other electrical functions are working. If you do, you will then want to verify you get 12v at wire #32 (Red-Blue) on the left post of the starter motor relay (see diagram) when the ignition switch is turned to the start position. If you don't, you will want to determine if you get 12v from wire #32 (Red-Blue) at the back of the ignition switch when the ignition switch is turned to the start position.