Polaris ATV Legend
Join Date: Feb 2009
Location: Washington State
well if it cranks when you jump the solenoid but wont turn over if you dont, that it sure seems that the start solenoid is toast. even if the battery is basically dead, the start solenoid should still be "clicking" over.
also, with the battery, you didnt mention that the battery had any type of charger on it for 5 months. even disconnected, a battery will naturally discharge itself about 1% a day. which means, in two months of storage, the battery is already 60% discharged, in three months it is 90% discharged. when a battery gets this low on charge, and especially sits like this for any length of time, sulfate builds up on the plates inside each cell, and blocks the flow of electrons. this is an inreversable process. if this has happened, you can put a battery on a battery charger, and it the charger will show it is fully charged according to volts, which is what a charger measures from, but the battery cannont hold the AMPS to start. take the battery to a shop, make sure it is fully charged first, and have them preform a LOAD TEST. this will only take 15 seconds and will show if the battery cannot recover from the amp draw. if it fails the load test it must be replaced.
start with those two things....first start with a load test on the battery