90 g2 take off when batteries connected.

90g2

I'm new to the forum and golf carts but I had my brother go pick up a 90 g2 36v the other day for me since I'm stuck offshore for 2 more weeks and my mind is wonder what could be wrong with it. I got it for $400 . With new tires and a back seat but no batteries. So I told him to take some batteries and make sure the motor worked, so when he touched the cables the cart immediately took off. The p.o. says he just replaced the solenoid so without being there to look I'm assuming he possibly hooked something up wrong or backwards but since I'm sitting here bored I want to go home with a plan and hopefully a quick fix to the issue so I can start other projects lift, paint, lights etc. Has anyone had this issue? Any insight is appreciated. Located on the MS gulf coast

BGW

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