Leaderboard

This could very well be noise caused by PWM variable speed motor controllers in your vehicle. Try installing a 1000uF 25V electrolytic capacitor right across the motor wires of each of the offending motors. Make sure you get the pos-neg correct. Electrolytic capacitors will EXPLODE if you hook them up backwards. Also, be sure to put the capacitors as close as possible to each motor. Putting filter capacitors 5 or 6 feet down the power line will do nothing for radio noise. You might also try putting large ferrite chokes on the leads where they come out from the motor controller modules. I also do NOT recommend hooking the ground wire of your radio straight to the battery negative, or to some random point on the chassis. This just by itself can cause noise from the vehicles onboard devices. Don't listen to what the "old timers" blab about this. That sloppy installation worked in the 60s and 70s, but not on modern cars. There is always a "Common Ground" point somewhere on the car that has a lot of different circuits all grounded to that one central point, usually within a foot or two of the battery. THAT is where you should hook your radio negative wire. THAT point is where the engineers designed your car to have the minimum noise for electronic circuit returns. Also, do NOT put a fuse in the black wire in a negative-ground auto installation. Argue with me about that later if you must. The red wire can go right to the battery, BUT there is most often a good power distribution take-off point to hook that up as well, right at the end of the main positive cable. It won't corrode over time if you hook it up to the power distribution point instead of messing with the battery. (DO put a fuse in the RED wire, as close as possible to the power source.) I just don't EVER hook anything but the car itself up directly to the battery. The engineers who designed your car made it that way on purpose. AGAIN: That old garbage of "just hook it straight to the battery" is just that... garbage. It is NOT 1960 anymore, and you are NOT running a 235 inline 6 cylinder with points and a condenser.

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