ALso in the RV worlds Battery cable colors is BLACK or any color is HOT +12VDC and WHITE ONLY is NEGATIVE 12VDC.
In the Automotive world the RED CABLE is always HOT POSITIVE 12VDC and BLACK is always FRAME ground NEGATIVE 12VDC..
SOmething these colors get mixed up because of the installed battery. Always hand trace the cable going to the FRAME ground and this always goes to the NEGATIVE TERMINAL of the battery for 12VDC battery. Or the second 6VDC Battery NEGATIVE TERMINAL in the series connections. Read this SYMBOL on the battery case to be sure...
Roy Ken