Is it a Jeep ?     Is it a Willys MB ?
Is it a Hotchkiss ?

Read ON

Read instructions first or when all else fails ?     Instructions for installing a 12 volt in car monitor

Identify the anode and cathode when connecting power. If not the fuse of safety box will be protective melted by protection immediately. At this time you should switch the junction of power and using the same type of fuse. Mustn't increase the current amount of the fuse casually and much less allow to short- connect with metal line.

I will stick to reading instructions "When all else fails"