[aprssig] Garmin 45XL External Power Req

[Chuck Gooden]

I was given an old Garmin 45XL by a friend and I was wondering if 
someone could tell me if it is safe to apply 12 volts to the external 
data/Power connector?  I have heard that some Garmins require a 
regulator on the external power connector but I am unsure at which 
models. 

Thanks,