Starter will not turn with ignition key

If your 2008 Polaris Trail Boss is not starting from the ignition switch but starts when you jump the solenoid, there are a few possible causes for this issue. Here are some troubleshooting steps you can follow:
1. Check the ignition switch: Even though you mentioned that you installed a new key switch, it's still worth verifying that the ignition switch is functioning correctly. Make sure it is properly connected and that the contacts inside the switch are not worn out or damaged.
2. Inspect the wiring: Examine the wiring harness connected to the ignition switch, solenoid, and starter. Look for any loose, corroded, or damaged wires that could be causing a poor connection or preventing the signal from reaching the solenoid when you turn the key to the "crank" position. Repair or replace any faulty wiring as necessary.
3. Test the solenoid: Even though you mentioned that the machine starts when you jump the solenoid, it's still worth testing the solenoid itself. Using a multimeter, check if the solenoid is receiving power when the key is turned to the "crank" position. If there is no power, the issue could be with the ignition switch, wiring, or a related component.
4. Verify the starter: Ensure that the starter motor is in good working condition. If the solenoid is receiving power, but the starter motor does not engage when you turn the key to the "crank" position, the starter motor itself may be faulty and need to be replaced.
5. Check the battery: A weak or discharged battery can also cause starting issues. Make sure the battery is fully charged and in good condition. Clean the battery terminals and ensure they are securely connected.
If you've followed these steps and are still experiencing difficulties, it may be helpful to consult a professional mechanic or a Polaris dealer who can diagnose and resolve the specific issue with your ATV.

Video below might help

if the battery is good.
and charged.
then the solenoid jumped will crank engine,(not start if you keep keys in pocket)
if that hot wire test fails and the battery and its lugs not green.
then the starter is bad.
try using a fresh known good battery first.
or jumper cable (AAA style) jump start it off a running donor car.
if the hot wire fails now, the starter is bad or the enigne is siezed.
can you spin the engine by hand, (using a socket and breaker bar , keys again in pocket::>?)
battery >>>>>>cables>>>>>starter.
this is all it take to crank the engine, just that. if you know how to hot wire a solenoid, do you? the switch below is just a jumper wire or even old screwdriver blade.
http://www.fixkick.com/starter-hotwire.jpg


battery needs to be 12.6vdc rested, is it ? or more.
less is discharged(and normal temps, not -40F)

the oldest GC.
see photo below... jumper at J.
as you can see security has zero to do , here.
if hot wired. zero.

The start switch ? Do you mean the starter relay your jumping the solenoid on the starter and it starts right but when your in the vehicle and you turn the key you get nothing right if this is correct the starter relay is no good when you turn your key in the steering column lock that moves the ignition switch on the steering column sending voltage to the relay then the relay sends it to the solenoid which then powers up the stater motor then it cranks the engine//// so the relay is bad

If battery is good, and you have a solid clean connection of the negative and positive, and car will not turn over, the next check would be the starter.. You can check if the starter is good by jumping the small wire (Solenoid) to the large wire on the starter. Just briefly touch the two together with a short piece of wire. If the starter roll, then you have a problem with the ignition circuit.. The starter will have a large lead running directly from the battery, what activates it is when you turn the key and the solenoid engages and make the two connect. When you jump the two you are bypassing the ignition key circuit and solenoid
Could also be a bad solenoid, this is usually the first to go bad on a starter and can be changed.. .

no crank
1: battery dead, not charged. does it jump crank?
2: bad battery (corroded clean em) cables lugs. (4 ends)
3: bad starter /solenoid, assembly
4: engine seized, (turn it by hand you cant?)
5: bad key line, (from key switch to PRNDL to stater , no connections)

jump start it, if passed test, battery bad/discharged , and if fail?
you then (battery is good)
hot wire the starter solenoid, keys in pockets
fail? yes, bad starter, seized engine. turn by hand , now you know.
if passes hot wire test, bad key line. (tiny wire)

easy huh?

hot wire starter you can short out ignition switch and wiring. to jump starter ignition switch start postion.you have to run 10 gauge jumper wire from the starter solenoid positive battery terminal to starter switch or S terminal on starter solenoid this procedure take two people but better remove starter replace starter solenoid. trying jumping off starter on camaro would be dangerous you have jack up car to get to starter and wiring person laying under car hot wiring starter while other person hold ignition start position put person under car in deadly position just remove starter have auto parts check it out first replace starter or solenoid if either bad. easier hot wire starter if starter under hood like my 1977 vega monza had starter at top could take long screw driver jump starter off.on the four cylinders engines back in the 70s. camaro starter under car dangerous trying to hot wire not a good idea.

check volts at starter while keying up.
try jumping starter solenoid out.

Possible ignition switch is not able to carry over 12 volts to starter solenoid on the wall. Measure using voltmeter, power coming in to small wire on starter solenoid. Should read battery voltage. If not, ignition switch may be shorting out.

If you've applied 12VDC to the solenoid and it does nothing, not even click, then the solenoid is toast!

Is your security light flashing ?if so you have a problem with the anti theft system.Leave the key on for 10 minutes ,then try this should reset the anti theft system