they come with a small battery and alternator that is pretty much maxed out by just running . you can purchase a (car audio 1.0 farad capacitor ) and it will solve your problems . this will kill the problem by keeping the voltage @12-14volts at all times . hope this helps . you can find these @ crutchfield.com
or sonicelectronix.com
73's
My issue was cured with simple bonding measures. Granted, I didn't go full bore, but didn't have to. I'm leaving it alone before something else pops up.