I wouldn't trust the meter on the supply all that much. Check voltage at
the radio if at all possible. I am not familiar with the Kenwood supply
you mention, bry it. Most have over current shutdown, so if the 590
draws to much, should just shut down. Probably a different plug for the
radio though. Universal radio use to sell an adapter. big plug to
little which fits the radio.
73
Butch
WA0VJR
Node 3148
Wallace, ks.