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Dithermaster
Member
I do not know the definitive answer but I assume it's just connected to the 12V battery, which is going to fluctuate. There would be no reason to have a special regulated 12V supply just for the ODB port.
It's connected to the car's 12v lead acid battery. The voltage goes up and down with load; it discharges to 50% multiple times per day before the big battery contactors close to run an inverter to recharge it. When parked and the big battery contactors are not engaged, the voltage will go up and down with load (lights, seat heaters) just like any car.
What electronic device do you plan to use? Make sure you check your manual for the fuse rating on the odb port.
garygid
Member
Just like an ICE battery, it is called "12 volt" but it might be as high
as 14.5 to perhaps 14.9 volts during charging and normal operation,
and might go down to something like 11 volts when the car is off and
the car's DC-to-DC system is not charging the "12v" battery ... which
happens several times a day, for around an hour each time.
So, unless your DC device is rated for about 10 to 15 volt operation,
it is likely that you should take appropriate precautions.
as 14.5 to perhaps 14.9 volts during charging and normal operation,
and might go down to something like 11 volts when the car is off and
the car's DC-to-DC system is not charging the "12v" battery ... which
happens several times a day, for around an hour each time.
So, unless your DC device is rated for about 10 to 15 volt operation,
it is likely that you should take appropriate precautions.
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