Starting related issues witha 2008 Acadia

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

Sounds like your new starter might have a bendix issue. Most all national parts stores are able to test the starter. I would pull it and take it to be tested.

Here's a link for a repair manual for 19.99 and here's a link on replacing your starter. RepairSurge Here's the free version. http://www.acadiaforum.net/index.php?topic=11891.0

You have a weak spring that assists the starter drive to retract from the flywheel.

Will require a scan tool to check for codes, make sure latch is working well, make sure release switch is getting signal. Most common concern is the latch itself though

Yes. When was the last time you had the starter changed? Has anyone crawled under the vehicle to check for a loose starter? If the starter does not engage it may be the starter solenoid ( the thing that drives the gears into contact before the starter actually turns ). This might not be ramming the gears together properly and that will cause the grinding noise, as well as an intermittent start.

your negative wire or posetive sumwhere is rusted and will not let the current pass through

it sounds as though your acadia may not actually be overheating, it sounds more like the tempeture sensor is bad, if its "froze" at a certain reading this could fool your computer, you should be able to replace this part for around 20 or 30 dollars. hope this helps

Your starter solenoid is likely the cause of your intermittent starting problem.

The solenoid sometimes will develop an issue where it does not engage to allow current draw from the battery by the starter, which causes intermittent starting issues.

If you hear a "click", during the times that the engine will not turn over, this is the most likely culprit. Replacement of the starter will solve the issue.

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