1996 Scrambler 400 4X4 – No Start Question

Hello Guys –

I friend just gave me a 1996 Scrambler 400 4X4 that won’t start. He said it was running a month ago, but died while his son was riding it. When we press the start button, the starter solenoid just makes a single "click" sound. We cleaned (wire brushed) all the battery/selenoid connections then tried the start button again…same results, a single "click" sound from the selenoid. He installed a new Polaris battery last year and we had it on the charger while we cleaned off all the connections, so the battery was fully charged during our test. Also, he used to be able to pull start the motor if the battery was low, but that is now froze up and we are unable to pull start the engine?

Any ideas???

Thank you in advance!