Wiring an external BEC....
 

....to power a 12V LED lightbar. I'll be running 3S & 2S Lipos in series to the stock HPI Blur ESC. Is this diagram correct?

http://i140.photobucket.com/albums/r...m.jpg~original

Looks like the BEC supports up to 6s input so your diagram isn't correct I'm afraid. You should run the BEC into the Y lead output or even at the esc power inputs.

Is this correct?

http://i140.photobucket.com/albums/r...2.jpg~original

No. Run the red wire of the ESC connector to the + of the BEC and the black wire of the ESC to the - of the BEC. Then adjust the output voltage to whatever you need for your lights. Skip the middle wire on the Y.

Like this? That was my first thought but unless I'm misunderstanding their diagram below, Castle says different when using a series setup.....
http://i140.photobucket.com/albums/r...3.jpg~original



Single: Shows to wire it up to the ESC + and -
http://i140.photobucket.com/albums/r...m.jpg~original

Series: Shows to wire it up to the Lipos + and -
http://i140.photobucket.com/albums/r...C.jpg~original

Your newly posted picture is correct in respect to what I was saying, but if Castle says not to do that, then you better ask them about it.

I believe castle are talking on the context of the BEC powering an Rx however you are trying to do something different. I still believe your last diagram is correct however might be best to check with castle themselves.

I'm not using Castles BEC, I'm using a different BEC (the BEC in the diagram) that has a set output of 12V. If anyone else can confirm which way to wire it up I'd appreciate it.

Looked at it again. Castle is showing a 12S input which is way higher than what the BEC can handle. They are saying connect it to one 6S pack, but do it on the true ground of the system. Your setup can run just like I explained.

I was thinking that too, since the smaller BEC is only rated for upto 6S and the series they're showing is 12S. I wasn't sure if it was due to being 12S or if I should wire it like that in general when using Lipos in series. Since that was the only series diagram they showed it was a little confusing.

Thanks for the help!

Hey guys, I plan to run two savox wp servos on my EMaxx and want to run the cc bec with the mmm2, I'm also running a fan on the motor and a fan on the esc. If I run a 3ch Rx how will all these plugs fit if at all? I realize I will have to run a y for the servos and a y for the fans but what will the ESC and bec plug into? ?

The only way to really power all those fans and servos is to run a few Y harnesses to get everything powered. YOu are probably better off using the BEC pro for the extra amperage, as the regular BEC is limited to 10 amps and can do the 2 servos but not sure if it could also have the amperage to power 2 fans.

With the BEC pro you get 2 legs of power and 20 amps, so would certainly be enough.

If it was me, I would power the servos and fans directly from the BEC, and then just right the white wire from the servo back to the reciever. Easiest way to accomplish this is with some modified Y harnesses.

Good luck

Ya I looked in to and I'm going to try a few y harnesses. I think the bec will be fine or at least I'm going to try, I can't see powering 2 fans being that much harder on it. I'm new to the electric stuff but I'm going to have the bec plug directly in the Rx and then accomplish 2 other channels with 2 y harnesses one for servos and one for fans. The rx has a port for batt, th, st, and aux so i believe i can achieve what im trying to do right? I have also pulled that red lead out of the esc. However I thought about eliminating the fans, I'm not sure if they are truly needed but more for security.