OK I will start out by explaining this whole situation.
This is actually on my old '90 2.3L Mustang, but I figure the ignition system is basically the same as the 5.0's. Back in like April, I was finishing up the new engine for my Thunderbird and I wanted to take the starter off my mustang ot put on that engine (the starter was practically new). When I went to take the starter off, I unhooked the negative battery cable and I swear when I touched the socket to the starter it sparked, so I disconnected the positive cable also. I swapped out this starter for an old one I had that I had thought was still good. When I put everything back together, the car wouldn't even crank, and I didn't mess with it anymore.
Fast forward to about a week ago, I put a battery back in the car to see what it would do. When you turn the key to the start position, the factory tach jumps to 500 RPM ( have a small aftermarket tach in the car and it does not move). Then when you turn the key to actually start the car, the tach jumps up like the car was cranking, except it's not cranking, all I can hear is a faint clicking sound from the starter. I'm guessing the starter is junk, but why is the tach jumping?
This is actually on my old '90 2.3L Mustang, but I figure the ignition system is basically the same as the 5.0's. Back in like April, I was finishing up the new engine for my Thunderbird and I wanted to take the starter off my mustang ot put on that engine (the starter was practically new). When I went to take the starter off, I unhooked the negative battery cable and I swear when I touched the socket to the starter it sparked, so I disconnected the positive cable also. I swapped out this starter for an old one I had that I had thought was still good. When I put everything back together, the car wouldn't even crank, and I didn't mess with it anymore.
Fast forward to about a week ago, I put a battery back in the car to see what it would do. When you turn the key to the start position, the factory tach jumps to 500 RPM ( have a small aftermarket tach in the car and it does not move). Then when you turn the key to actually start the car, the tach jumps up like the car was cranking, except it's not cranking, all I can hear is a faint clicking sound from the starter. I'm guessing the starter is junk, but why is the tach jumping?