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Procedure 4: Check Amplifier if you experience excess Engine Noise.
1. Route all signal carrying wires (RCA, Speaker cables) away from
power and ground wires.
OR
2. Bypass any and all electrical components between the stereo and the
amplifier(s). Connect stereo directly to input of amplifier. If noise goes
away the unit being bypassed is the cause of the noise.
OR
3. Remove existing ground wires for all electrical components.
Reground wires to different locations. Verify that grounding location is
clean, shiny metal free of paint, rust etc.
OR
4. Add secondary ground cable from negative battery terminal to the
chassis metal or engine block of vehicle.
OR
5. Have alternator and battery load tested by your mechanic. Verify
good working order of vehicle electrical system including distributor,
spark plugs, spark plug wires, voltage regulator etc.
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