Bravo EVT 4000e Scooter - DC2DC Converter

[ProtonPozer]

Hello All,
On my Bravo EVT 4000e Scooter, there is a Chroma 48VDC - 12VDC Converter, which I assume is to operate the lights, horn, etc.
It is pictured here along with the four wires that are connected to it.
My question is simple:
The four wires are BLACK, RED, GREY and WHITE.
Which pair are the 48VDC (in) and which are the 12VDC (out)?
My on-line search was fruitless.
Greatly appreciate the time you took to read this.

 

[wturber]

Why not check to see what voltage is on the connector that the converter's plug is supposed to plug into?

That said, both of the DC converters I've used to get a 12v supply on my ebikes have had the Red/Black as the higher battery voltage. The 12v came out on the Black/Yellow. So if I had to guess, I'd guess the Red/Black was your 48v input and the Green/White is the 12v output. But this is a guess. I like verifying via the connector better.

 

[ProtonPozer]

wturber,
Thanks for responding. My preference is the same as yours however, My challenge is that using the existing wiring harness and a new controller, until I figure out how to wire in the new controller (It seems that power to the converter is sourced through the controller) I can't determine where the connections go. I don't want to wire it backwards.
I am hoping that someone on this blog will have a Bravo EVT 4000e or have an e-Scooter that uses the same converter and can take a quick reading for me at their wiring connections.
I understand your reasoning, but I would want to go with BLACK/RED as the 12VDC.

 

[ProtonPozer]

wturber,
Thanks for responding. My preference is the same as yours however, My challenge is that using the existing wiring harness and a new controller, until I figure out how to wire in the new controller (It seems that power to the converter is sourced through the controller) I can't determine where the connections go. I don't want to wire it backwards.
I am hoping that someone on this blog will have a Bravo EVT 4000e or have an e-Scooter that uses the same converter and can take a quick reading for me at their wiring connections.
I understand your reasoning, but I would want to go with BLACK/RED as the 12VDC.

With the help of another EVT 4000e owner, I was able to figure out the wiring polarity for the DC-DC converter. For others it is:

Grey - 12VDC (+)
Black - 12VDC (-)
Red - 48VDC (+)
Green - 48VDC (-)