Applying Trailer 12V to Trailer Brakes
I use an electric trailer dolly to precision position our TT after pulling it onto our paved parking pad. (We have very limited manuvering room) The dolly has a 7 pin connector cable and a brake contr...
Forum Discussion
dclark1946 wrote:Old-Biscuit wrote:
No problem
If you look at end of trailer umbilical cord plug with raised part UP
11 o'clock is 12V HOT
7 o'clock is brake controller output
Make up a momentary spring loaded toggle switch with flat terminals and push them into corresponding pin positions
Then toggle on/off for braking as needed.
When On you will have FULL trailer battery voltage so limit amount of on time.
Otherwise brake magnets could be damaged
So I sometimes have the brake on for about a minute or so since our pad has some slope. How long can you leave 12V applied before causing damage? I can put a small (0.1 - 0.2 Ohm) power resistor in series to limit current.
That minute or so is not an issue
An hour or more could be...... (Fed DOT requirement is full voltage for 15 minutes via emergency brake away switch)
That is why I suggested spring loaded momentary toggle switch so that it can't be LEFT on
