Series 3 came out, in the US, in 1972, August '71 in the UK.
My '64 is 2441xxxxxx, and my '71 is 2444xxxxx, so I'm guessing you truck is in the '66-68 range.
The instant and obvious things to spot in determining a 2A from a 3 are the grill and the windshield hinges. The RED winsdhield hinge shown below is 2A, the BLUE one is S3.
The 2A Grills are galvanized wire and further divided into "early" and "late" Early has it's headlights in the radiator panel, and Late, they were moved out to the wings. The earliest "Late" was the one called the bugeye, where the headlights had chrome bezels and stuck out of the wing panels (almost as an afterthought (Not Almost, it actually was an late, Rube Goldberg change to meet new laws requiring a certain headlight spacing, but the new front wingpanel had yet to be produced, so they simply hand cut a hole and mounted a generic headlamp in the hole)
Series 3 has a molded plastic grill. The simplest way to quickly note whether its + or - Ground, is to look at the battery (This assumes you aren't positive what year it is) Which battery terminal is wired to the chassis, and which one is wired to the solinoid (or bulkhead mounted manual stater switch)
Many early positive ground trucks have been converted so whether it has a manual starter switch or solinoid is not a good indicator.
A positive (yuk yuk) way to know is to take your multimeter, in the Rx1 setting, with the battery disconnected and see which of the two aux sockets in the dash gives you a minimum resistance reading (the closest to 0ohms)
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BEST 4x4xFAR!
. Where abouts are you from? Is it gas or diesel. As to your first question the VIN is typicaly located on the fire wall under the dash area. Another good place to look for numbers is on the valve cover though that can be a faulse lead if the engine has ever been replaced. For your second question all I can advise is to hook up a battery and see what starts smoking
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