DrewE wrote:
The best rule of thumb I know of is to ignore the color of the wires completely and instead trace where they go. If the battery cable goes to chassis ground, it's a negative cable, regardless of whether it is white, black, pink, green, red, orange, or periwinkle with a lavender stripe and sage polkadots.
On my RV, the positive battery cable is red and the negative is black, for what it's worth. The negative has been replaced at least once and maybe more than once; the positive appears to me to be original, but who knows.
X2.......
There are NO color standards.
Check cable connections PRIOR to removal......mark them, photo them, ignore them.
BUT always verify which is which PRIOR to re-connecting cables.
Previous trailer.......RED/+ and Black/-
Previous 5vr...........Black/+ and White/-
This 5vr...............Red/+ and GREEN/-