Negative ground.
red is positive on a negative ground system
Negative ground.
negative ground
Yes.
The system is negative ground.
it has a negative ground system.
Some never used positive ground and always had negative ground. The last year that I know where positive ground was used was in 1969 when Jaguar switched to negative.
Negative ground
Yes.
The Suburban has a negative ground system.
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.
Electrical sytem positive ground