Short In System.
posted by Kenwoodie on Aug 25, 2006
Ok so i have this kenwood and a 1 farad cap hooked up to it and it keeps overheating. It seems i ahve a short in the system because when the sub hits i can see a lil electric shock going from the case to the screws where I screwed the amp down. So im pretty sure the case is getting power when it shouldnt and its causing overheating. Can someone please explain how to fix this short?
Comment by Kenwoodie, posted on Aug 26, 2006
I have a 4 gauge grown wire with a 4 gauge loop connector connected to the chassis of the car by a big bolt. Also ive been running it for 4 months and the head hasnt blown. Thank you for the quick reply and if theres anything else you can think of please let me know.
Solution #1
posted on Sep 08, 2007
ApprenticeObviously you are using the mouning screws as the power ground connection. Disconnect mounting screws from the case.be sure a short heavy gage wire is connected from the ground of the terminal strip to the car body. clean bare metal only with a star washer. If the connections are not good the terminal strip will over heat and melt.This is common.measure with a DVM the case of the amp to the car body.disconnect the input jacks. turn on the system. The voltmeter should read 0 volts. I ou have any other reading or the amp won't turn on with the input jacks removed you hve an open power ground on the circuit board. If the power ground is open well the voltge wil find the next available way to get to ground. Usually will burn out sigal grouns in head unit and amp. Take out the board and look at the trace connectedto the terminal ground. Jumper and resolder it.
Solution #2
posted on Aug 25, 2006
WizSounds to me like you have a bad ground. Usually the amplifiers case is ground and you should see no spark. But if the ground is bad. When the downbeat hits the current draw can go up by multiples. The ground is dirty or too small the amplifier tries to draw it elsewhere. So even though you have a cap. You would be running low voltage under load. causing the switchmode power supply in the amplifier to work harder to keep up the rail voltage in the amplifier. The transistors switch faster. The faster they switch the more heat they create. And your amplifier gets hot. The only other thing is if the toryoid coil in the amp is shorting. causing high voltage to case. But this will generally burn out the head unit in the vehicle unless you have a ground loop isolater. To determine check to see if there is unusual voltage at the RCA's.
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