Side marker wiring/Haloview side camera confusion.

[chaostactics]

Ok I thought this was going to be straight forward but not so much.

TLR Which wire is which hot which ground?

So I'm trying to install Haloview BTC129 cameras. I pulled the forward LED side marker light, cut the two black wires and stripped them back.
In the pics I've labeled them "Left and right" to keep them separate for ID purposes.

The three wire capped wires were wiring present but not connected to the preexisting LED side marker light, just tucked behind.

I think the left one is the hot? Using a multi meter if I measure both side marker lights ("Left" and "Right") I get 12.5V. Measuring Left to all other wires except solid green results in 0V. Left to the solid green results in 14V.

I know some RVs side marker lights can also function as a turn signal. Mine don't appear to I think... putting on the turn signal and connecting left to all other wires does not result in any voltage change. I don't need the forward side markers to function as turn signals but it'd be neat as there's a "trigger" wire on the haloview that's supposed to auto switch to that camera when you activate the turn signal for that side with the tow vehicle.

OF NOTE: When all 5 wires from the front side marker are disconnected it does not cause an outage on the rear marker light on that side.

[Patio]

if you hook your meter up with red to negative and black to positive, the reading should show negative (-) before the volts. Then you will know to swap them and which one is negative. Pretty sure though you are right with referencing the ground though.

[chaostactics]

Originally Posted by Patio

if you hook your meter up with red to negative and black to positive, the reading should show negative (-) before the volts. Then you will know to swap them and which one is negative. Pretty sure though you are right with referencing the ground though.

Hmm I've tried. I get 14 ish V when bridging to the multimeter. I also get 14 is V when going from one wire and the frame and get 0 V when going from the other wire to the frame.

But when I hook up the wiring on the haloview I get nothing.