In programming, you still need to connect as previously mentioned...again, you can NOT disable the 180's BEC.
In connecting the ESCs to the receiver (for normal operation), you'll still need to user the Y-harness previously mentioned (ie. where one ESC's red wire does NOT reach the receiver). Additionally, if you're going to use external BEC(s), you'll need to cut/remove the red wire from where the external BEC(s) connects to the receiver (in other words, DON'T cut the red wire on the ESC line). This is because, once again, you cannot disable the ESC's BEC.
Alternately, if you don't want to cut any wires, Homes Hobbies makes an excellent BEC harness designed specifically for using a servo connected to an external BEC, allowing all connections to be made between receiver, servo, and BEC...all WITHOUT cutting ANY wires. It's called the "Holmes Hobbies Receiver Bypass Adapter.
https://www.amainhobbies.com/holmes-...BoCelIQAvD_BwE
It was actually designed for use in crawlers...but, will work perfectly well for what you're intending. In the product's 'overview' section, be certain to read the "NOTE", as it tells you exactly how to connect everything (except the ESC (or, in your case, ESCs) which get connected, one again, as previously described using the ProBoat Zelos Y-harness).
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