Took my ev6010 generator out and put it back in but hooked up the starter motor to the ground not to the positive and now it wont start. I also changed the oil and coolant.

I'm sorry to hear that you're having trouble with your Powerhorse 9000ES generator. While I don't have specific information on the wiring of that particular generator model, I can provide some general guidance.

Typically, a generator's battery is connected to the starter motor and the electrical system. The positive wire from the battery is usually connected to the starter motor or the starter solenoid, while the negative wire is connected to the generator's chassis or grounding point.

As for the additional brown wire that changes to black and has an eyelet, it's difficult to determine its exact purpose without more information. However, it's possible that this wire is intended for a specific accessory or component of the generator. It may be a ground wire, a wire for a charging system, or a connection for a specific electrical component.

To ensure proper and safe installation, I recommend consulting the Powerhorse 9000ES generator's manual or contacting the manufacturer's customer support for detailed wiring instructions. They should be able to provide you with the specific information you need to properly connect the battery and any other wiring components.

What is model year? Sometimes when you replace engine you may need the computer from donor vehicle as well? Any testing at starter motor make sure tranny is in park or neutral and parking brake is set.
Make sure battery has a full charge and connections all good? You can turn crank by hand, correct? The engine isn't seized? The starter motor usually has two voltage circuits, one comes from the battery, hot all the time. The other circuit goes hot with key in the crank position and may be wired through the neutral switch for automatic tranny. The starter motor usually grounds through engine block. So, grounds are important.
You can take starter motor off, lay it on the ground, hook up jumper cables properly from charged battery to starter motor, at the least, it should kick out drive gear and spin.

https://s2.postimg.org/fcuoymde1/escort_starter.jpg
Click on the link.
Make sure battery has a full charge and battery connections all good. Two voltage circuits at the starter motor, one comes from the battery, hot all the time. The other goes hot with key in the start position and is wired through clutch switch, I haven't looked up info on your clutch switch. The starter motor is grounded through engine block. Any testing at starter motor, make sure tranny is out of gear and parking brake is set.
You can check the starter itself, take it off, lay it on the ground, hook up jumper cables properly from battery to starter motor, at the least, it should kick out the drive gear and spin.

your carb is blocked and you will have to clean it and also check the filters for blockages

If you have an ohm letter or continuity tester, put the probes across switch and depress kill while reading meter for a change in resistance. Possible the switch is just bad. If the meter doesn't indicate a change in resistance, switch is definitely bad.

Yes the neg cable is grounded at the starter bolts and also at the frame.
Do you have power coming from the starter relay down to the starter solenoid with the key switch in the start position ?
Do you have headlights when you try to crank the engine ?
Have you tried cranking it in neutral ?

IF STARTER RELAY BAD THE STARTER WONT MAKE NO NOISE AT ALL HEADLIGHTS WONT DIM.IF YOU CLICKING NOISE BATTERY VOLTAGE TOO LOW. MAKE SURE BATTERY VOLTS ARE 12.6 VOLTS AND USE TEST LIGHT TO SEE IF STARTER GETTING POWER.COULD HAVE BLOWED IGNITION FUSE OR FAULTY IGNITION SWITCH. TO CHECK STARTER SOLENOID FIRST TURN OFF RADIO THEN REMOVE NEGATIVE BATTERY CABLE AND POSITIVE BATTERY CABLE.THEN REMOVE STARTER BUY A REMOTE SWITCH.YOU NEED BATTERY JUMPER CABLES HOOK BATTERY JUMPER CABLES TO BATTERY PUT POSITIVE CABLE ON POSITIVE BATTERY POST THEN PUT NEGATIVE BATTERY CABLE ON NEGATIVE POST. HOOK BATTERY CABLES TO STARTER USE NEGATIVE CABLE GROUND STARTER BODY AND PUT POSITIVE BATTERY CABLE ON THE LARGE POSITIVE POST ON STARTER SOLENOID. NOW TAKE REMOTE SWITCH HOOK RED WIRE TO STARTER SOLENOID POSITIVE POST THEN HOOK BLACK WIRE TO REMOTE SWITCH TO STARTER SOLENOID SWITCH TERMINAL WITH LETTER S THEN PRESS REMOTE IF STARTER SPINS STRONG WITH A GOOD KICK STARTER GOOD.YOUR PROBLEM COULD BE CORRODED WORN BATTERY CABLES. WEAK BATTERY FAULTY IGNITION SWITCH. IF STARTER DONT WORK WHEN YOU PRESS THE REMOTE SWITCH STARTER SOLNOID BAD OR STARTER ITSELF BAD.IF ALL IS GOOD. CODE SCAN CAR FOR THEFT SECURITY FAULT CODE.

your starter button is malfunctioning. maybe some oxidation in the switch. when starter button is pressed in that can cause your other electrical stuff to not work.

well i would try turning motor over buy hand if you cant PULL THE PLUGS OUT AND THEN TRY TRUNING MOTOR OVER SEE IF IT IS FULE LOCKE UP IF NOT AND YOU CAN TRUN THE MOTOR OVER BUY HAND STAT LOOKING AT BATTERY CABELS OR BAD GROUNDS HOPE THIS HELPS

I have seen this happen in cars- the problem is most likel the ignition unit -they do not spend a lot of money on them in production. So here is what is happening . When you are putting key in and out metal filings are being deposited inside unit- this is now causing a short and draining batteries. Start here.This happened with cars a few years ago and they were catching fire in driveways.Call dealer and get replacement ignition- should be cheap fix. Good luck.