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Joking aside
Generally RED is +ve POSITIVE / BLACK is -ve NEGATIVE
EXCEPTIONS include blue as +ve brown as -ve (German Vans) and others but generally if you are adding or creating from scratch either be aware and use the same colours or go with the above.
Use a 12 volt meter to establish which is which. The red test lead is positive and the black negative, if you put them on the wires that you are investigating they will give a reading "X" if RED is on the +ve OR "-X" if polarity is reversed. So red on blue black on brown on a hymer as the example will read 12 volts or more rather than -12 volts
IGNORE all confusing words like live and neutral! completely incorrect when discussing DC "Direct current" circuits
This thread is ONLY about DC
Current flows from +ve to -ve
All circuits must have their own fuse. The fuse protects the wire from overheating or catching fire.
The size of the wire must be more than big enough for the current it is expected to carry and the fuse smaller than the wire can handle continuously
To control a circuit involves a switch on/off and this is always placed in the +ve and this too must be rated to carry the maximum current.
This thread will grow legs and run
Joking aside
Generally RED is +ve POSITIVE / BLACK is -ve NEGATIVE
EXCEPTIONS include blue as +ve brown as -ve (German Vans) and others but generally if you are adding or creating from scratch either be aware and use the same colours or go with the above.
Use a 12 volt meter to establish which is which. The red test lead is positive and the black negative, if you put them on the wires that you are investigating they will give a reading "X" if RED is on the +ve OR "-X" if polarity is reversed. So red on blue black on brown on a hymer as the example will read 12 volts or more rather than -12 volts
IGNORE all confusing words like live and neutral! completely incorrect when discussing DC "Direct current" circuits
This thread is ONLY about DC
Current flows from +ve to -ve
All circuits must have their own fuse. The fuse protects the wire from overheating or catching fire.
The size of the wire must be more than big enough for the current it is expected to carry and the fuse smaller than the wire can handle continuously
To control a circuit involves a switch on/off and this is always placed in the +ve and this too must be rated to carry the maximum current.
This thread will grow legs and run