Engine turns over but doesnt start utill booster cables are hooked to it

So it does turn over or no it doesnt turnover.

Same problem with my mxu 500. Charged battery. Nope. Checked all connections in starting system. Nope. Swapped out solenoid relay. Fixed mine. Was cheap online- less than $20. Mine would start with jumper cables or batt charger on 80amp boost. Good luck!

have you tested it with a booster pack with the negative clamp directly on the engine and the positive clamp directly on the bendix

check earth cable/s
dont jump start with a running car engine,it will send too many volts.
do you have spark?

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Where did you ground the winch motor? You need a separate, heavy duty, switch with a relay to transfer the positive side voltage properly... DO NOT ground to the battery..use a clean, free of paint, place to ground. You may have fried the solenoid..do not connect the positive side to the solenoid. Direct connection to the + battery from the relay is good with a good waterproof fuse in line. Sometimes I have seen the "maint. free" batteries die when used "wrong" and still show 13 volts+.

check the cables too and from the stop switch

The starter has to throw it's gear out using centrifugal force. The speed of the starter has to be enough to overcome the spring inside. It is either a little seized and needs to be rebuilt and greased up, or the battery isn't powered up enough to get the right speed to engage properly. In that case clean the battery posts and clamps well, then charge or replace the battery. To know if the battery is bad wait till it is charged... if it still doesn't engage try again with booster cables from your car etc. and see if it suddenly works fine.

The battery voltage on a Suzuki I had would drop low enough during cranking with the electric starter motor not allowing the spark to be strong enough to run, the voltage regulator also didn't function correctly once and as the battery voltage dropped during operation engine would start to bog down and cut out due to low voltage for the ignition system.