The system is negative ground.
it has a negative ground system.
red is positive on a negative ground system
The Suburban has a negative ground system.
I doubt it but I am not 100% sure. It is unlikely in 1983 BMW was using a positive ground system. You can easily find out. Trace the negative battery cable and see where it goes. It is is attached to ground then it is a negative ground system.
Yes, this tractor has a positive ground system. It may have been retrofitted to 12 volt negative ground over the years though.
Post the year, make and model of the vehicle (in new question) and one of us can tell you if it is negative or positive ground.
Positive Cable from Battery to ground location on frame Negative to Starter Use #2 guage cable for best results Answer No. 2 You don't wire positive ground. Wire negative ground and you will forever be thankful. With a positive ground car everything, like a radio, elect fuel pump, elect fan or anything you add will have to be isolated because everything is made negative ground. You can't wire stuff made negative ground to a positive ground you get the shorts.
Find the cable that is connected directly to the frame or sub-frame of the car. If it is red, then Positive is ground; If it is black, then Negative is ground. More than likely (but not in all cases) the electrical system is Negative ground.
The quickest and best way is to look at the battery. If your positive cable (+) is going to the frame or body, positive ground. If the negative (-) goes to the frame or body, negative ground. I believe that a MF 35 is a neg ground system but use the check from above.
Make sure thatit is isolated from other electrical components
BEcause the electricity actually runs from The Negative side of the battery to the Positive. Electrical charge is a "Negative" charge. But the layman thought that sounded wrong and eventually even the english gave in and went to Negative ground systems.
If the 49 dodge truck is still on it's original 6 volt electrical system it is positive ground. All 6 volt auto systems are/were positive ground. All 12 volt systems are negative ground.