Howdy and welcome from Northern Iowa
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Hooking to the main battery like you mentioned is the way most owners do it.
When the main battery is charged, the tru-isolator opens and charges your secondary battery.
Just FYI, the tru-isolator will work either way.
If you hooked the tender to the secondary battery, when it is charged, the tru-isolator would open and charge the main.
.
Most hook to the main, because if the tender is not strong enough to get the battery fully charged, it will NOT open the tru-isolator. In that scenario, the secondary battery would not be charged.
.
Have a good day
.
Hooking to the main battery like you mentioned is the way most owners do it.
When the main battery is charged, the tru-isolator opens and charges your secondary battery.
Just FYI, the tru-isolator will work either way.
If you hooked the tender to the secondary battery, when it is charged, the tru-isolator would open and charge the main.
.
Most hook to the main, because if the tender is not strong enough to get the battery fully charged, it will NOT open the tru-isolator. In that scenario, the secondary battery would not be charged.
.
Have a good day
