I just checked again and with the car off the BAT terminal on the fuse panel is giving 12.3 volts DC and 26.5 volts AC. This has to be the problem. How the hell can AC current be showing up on my multi meter when on a DC circuit from the battery.
When you are being shown this correct 12 volt DC, is this with the engine off but the key in the run or accessory position ?.
-BAT terminal on fuse panel reads 12.2 volts when engine is off. ACC reads 12.2 when key in ACC position, 14.0 - 14.1 when running. Radio does not turn on in ACC position but sometimes I can get it to turn on if I turn the ACC position on and off about 5 times.
What AC current reading are you getting and on what wires ?.
- I get between 20 and 25 volts AC on the BAT and ACC wires.
Is the stereo new, used, old, or of unknown quality ?.
- Brand new, second one I have tried of the same model radio. Radio is good.
Is the stereo connected directly to speakers or is there an amp involved ?.
- No external amp, biult in 50 x 4 (200 watt)
I'm not a fan of putting on filters but I wonder if there is a problem with the stereo getting too much voltage when the engine is running ?.
-Voltage with running engine is never higher than 14 - 14.1 volts. DC voltage is not a problem, numbers are all in the correct range.
I wonder too is it's an older stereo that maybe some filter caps have dried out or vented allowing noise into the system ?.
If the radio is connected directly to speakers, are one or more possibly shorted to the chassis of the car to where this could be causing the radio to have noise ?
-Professionaly installed speakers and wires with proper insulation.
If an amp is involved, are the gains properly set, RCA's run properly or is the amp of questionable quality ?.
- No amp
I found this 15 amp noise filter, since my radio requires a 12 volt from the BAT and a 12 volt from the ACC would I need 2 of these?