Hello again,
1985 GT 5.0 newly rebuilt motor installed last month. Thought everything was good to go but the starter was really slow to crank. Took the spark plugs out and somewhat faster but not near enough to start engine (especially with in). Tested the battery (tried another one as well), tested starter, bought new starter and installed only to have the same slow crank. All connections are clean, new solenoid, new positive cable. Unbolted the starter but left positive lead on and used jumper cable to ground starter to frame. Seemed to me it spun like it did on the bench test at the parts house. Lights dim and pulsate when turning over as if there is a major drain going on somewhere. Checked grounding strap connection too. Turned the crankshaft with torque wrench and takes *maybe* 20-25ftlbs to turn, so clutch binding doesn't seem likely. My thinking is electrical/grounding but I'm running out of options of known things to try.
To add: I have used jumper from installed starter to frame and also bypassed grounding strap with cables. Any help/suggestions would be appreciated. Surely someone out there has seen this before. TIA
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