I've been a tech for years, and sometimes any assumption that something is "good" can be the one thing that trips you up for awhile. This is a really tough problem, since you've done about all you can to solve it. Here's what I suspect...either the batteries don't have the same current capacity as the old ones, or they could be underengineered, or even defective. I've bought car batteries, on two occasions, that were bad, even though they swore they were good.
You'll have to get someone to test them for their load capacity, that's the only thing I can figure at this point. Not sure who will have this capability- you might call around to some service shops and see if they can help, or know someone who can.
If all the connections are good, and the motor is new, there just leaves the harness itself and the batteries to suspect.
Ensure the batteries are good, and then you will have to check the cables for load capability and integrity.
Good luck, and hope this helps.
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Had batteries tested locally and found they were indeed defective both sets! read a mere 160 cold cranking amps of rated 300 cca even though they were fully charged at 14volts. Will stay away from Universal Brand Batteries in the future
Thanks your solution did help, had the batteries tested locally at a battery specialty shop and they found both sets had reading of about 160 cold cranking amps when they were rated for 300 even though they were fully charged at 14.5v. I know now to stay away from Universal Brand Batteries in the future....thanks again
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