https://goo.gl/photos/DBtjLwMrpZ8sjmLYAHere's a note on the Tow Vehicle Picture: There are 3 Relays (rather than two), because I didn't have access to the original "Trailer Battery Charge wire" under the hood, after the fuse. It's hidden within a gigantic bundle.
So, before the two 12/24 "switching" Relays, there is (1) a direct battery connection with a new fuse (30A), and (2) an initial Relay, which switches "on" whenever the engine is actually running.(My new Trailer Battery Charge" circuit is not activated by merely turning on "accessories".) I pulled the fuse for the OEM circuit.
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Meanwhile, in the Trailer: the schematic shows 3 Relays, allowing for an automatic switch of "Bargman 12V" back into the "+12V" power distribution, whenever the 24V coil Relay is not activated. But per above, we never want this if:
- The Trailer will never be pulled by a different, 12V-only Tow vehicle; and
- You can always remember to flick the "24V mode" switch when pulling the Trailer, and sun conditions aren't perfect.
