I've run out of ideas on this so maybe you guys can help.
Less than 6 months ago the starter solenoid started acting sluggish. It would spin but not engage. I had to hit it with the key 5 or so times before it would engage and fire right up. After the engine warmed up it would engage on the first try. Its a pretty new starter (Mits), a year, maybe a year and half old. I took it to the Zone and it tested good (yeah right, I thought). I put it on the bench and jumped it from the battery and it engaged and spun as expected. Ok then, I started looking elsewhere.
Battery voltage was good, but I took it down and had it tested. Good.
I tried jumping from another vehicle but it didn't help.
I ran a straight line from the positive post to the solenoid post, no help.
I ran a ground wire from the starter bolt to the main ground connector on the body no help.
I measured voltage at the solenoid post, battery voltage present.
I measured voltage from the ignition, battery voltage present.
So, off the truck it engages with the battery voltage, but on the truck it doesn't. What the hell? Any ideas before I start buying new parts that I'm sure I don't need?
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