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Ran my '07 450 a short time today. I went to restart and as soon as I touched the starter the display when blank - no power. Heard a small pop left side by fuses. Checked the two 30 amp fuses - okay. After a couple of hours I noticed the display was back on. Touched the starter and same thing - small pop sound and display went blank. Only electrical thing I've done in the last five months is replace the ignition switch (aftermarket). I could put the original back in. Where should I start troubleshooting?
 

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Sounds like a short or break in the wiring harness. I would inspect the harness for chafing or melted wires. Pay close attention to wires under the gas tank, near the exhaust and where they run up near the steering stem.
 

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Might be a bad starter relay
 

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Might be a bad starter relay
Rick is on to it here.

Forget what I said in my post above. I wasn't thinking correctly when I made that post and read into it completely wrong.

Anyway. It could be a loose battery terminal. Loose starter solenoid terminal, or a bad starter solenoid.
The battery solenoid is near the battery. Follow the battery positive wire. It will go straight to the starter solenoid.
 
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I had 2 2007 450 grizzlies and I found the relays go after a while. Mine started failing after about 8 yrs.
 

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Do NOT buy the aftermarket junk solenoids out there for $10 on amazon. I fell in that trap and it worked for two weeks. Just bite the bullet and get the OEM from Partzilla or the like.
 

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Pull your battery connections and give them a good cleaning, some di-electric grease (if you have some) and re-attach. Could be bad battery connections and when the starter requires maximum AMPS to turn it over the bad connections shorts and looses power to the complete system.
 
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