Not a expert but have brought and worked on my share of carts,,, I am a gas man myself (4 cycle)
Lets talk electric,,, if you are gonna pay a premium price batteries need to B less than 2 years old and a name brand,,, not reconditioned bats,,, most bats have a code that will tell ya their age,,, its stamped into the top are side near the top,,, must be some type of hot branding iron deal,,, it will B sum'n like this
C6A8,,, C= march 6= 2006 dunno what A8 Means but would guess Amps 800
Next i would take it for a spin,,, most electrics use a 5 speed type motor throttle set up,,, you should B able to feel all 5 speeds.
Slowly press the GO pedal,,, fist click you hear is speed 1,,, speed one is just enuff to get it roll'n smoothly,,, and as you depress the GO pedal EZ you can feel and hear it click as you go threw the other 4 speeds.
Look at the frame under the batteries,,,, some rust out (not good),,, I like Cub Cars for electric and EZGO for a gas model (just my preference)
A gas EZGO with a Robin engine is as simple as it gets,,, Parts are extremely expensive Though,,, use your judgment on the condition of a gasser.
One tip off that the cart has a problem is that they have brought another cart (he he) If nuttin was wrong with the one they have then why did they buy another one.
New are almost new carts are not that bad of a price,,,, shop around,,, then you will have some I.D. of what a used cart should go for.
when i go look'n I run'em like I stold them,,, drive'em for at least 15 min and hunt steep hills.
you would not believe some of the lies folks have told me.
I use the net to figger out repairing carts,,, one thing I have found,,, use common sense,,, just cuzz you get a reply from a guru don't mean he's a rocket scientist
I would not take a share in a gold mind for my cart,,, most handy thang I have ever brought