On my wolverine I want to run a optima yellow top just to have more power and AMP hours would it be safe to run the optima with the stock battery or completely do away with stock battery and run one big battery and extend my cables? Any input would be appreciated.
Well, the short answer is, no, it is not safe to run the new yellow top with the stock battery.
You can either run a second, identical to stock, battery that is tied in parallel; or you can eliminate the stock one and throw the yellow top in there. However, word of caution:your stock stator will not charge the yellow top any more than it would the stock battery. So, for example, if you are buying this battery because you're running the stock battery down with a winch, then the yellow top will only prolong the inevitable. It will still discharge the battery past what the stock stator can handle, it will just take longer to do it.
So, if you really want to upgrade, here is what I recommend. Buy your battery of choice, optima yellow top, duralast gold, whatever turns you on(FWIW I would take the Duralast Gold). Remove the stock battery, reroute the wiring to the new location. Install a quick disconnect battery tender lead, and plan on plugging in your machine whenever it is not in use. This will ensure a charged battery whenever you need it, and give you a greater capacity for winching out those popo's..lol
Hope this helps.