It is usually red.
In most properly wired cars, a red cable goes to the positive terminal on the battery, and a black cable goes to the negative terminal. If color coding doesn't work, negative is the ground cable, positive is where your power is going.
There is no way that the positive battery terminal was ever connected to the chassis. This would be a dead short and would fry the battery. Negative to chassis is correct, but positive to chassis, no way. That positive cable goes somewhere else.
The positive end of a battery goes to the positive end of the terminal. In retro spec, the negative end of a battery goes to the negative end of the terminal.
The battery is under the saddle. The red cable goes to the terminal marked positive (+) and the black cable goes to the terminal marked negative (-).
the thick cable goes to the battery positive terminal . one thin wire goes to ignition switch
There are typically two cables, one is usually red and the other black. The black cable attaches to the negative terminal on the battery and the red wire connects to the positive terminal on the battery. When removing the battery from the vehicle always remove the negative cable from the battery first. When installing the new battery always connect the negative cable to the battery last.
The positive battery terminal goes to ground, the negative terminal goes to the starter solenoid.
Positive Battery Cable Routing on F-150sI'm not familiar with your '85 model, but I have both an '89 and a '93 F-150 with the same 4.9L/300 straight six engine. On both of my vehicles, the cable from the Positive terminal of the battery goes to the input [always "hot"] terminal of a solenoid mounted on the right front inner fender. A similar heavy cable goes from the solenoid output [ignition switch controlled] terminal to the starter.There are also lighter conductors that go from the hot input terminal of the solenoid to the vehicle's electrical system.
The red battery wire goes on the positive + battery terminal no matter which side it is on. The black wire goes on the negative - terminal.
Obviously the positive one....which is best found by being the one that DOESN'T end at a ground point. the easiest solution to that is to start from the starter. the LARGEST (presumibly black) wire from the starter to the battery terminal is the GROUND. that would make the other terminal the positive.
Audio battery???? If you mean Auto Battery then Red Positive (+) RED cable goes to Positive (+) post on battery. Black Negative (-) cable goes to Negative (-) post.
The positive battery cable goes to the starter, alternator, and electrical system. You need to consult the manufacturer for vehicle specifics.