Hissing engine noise coming thru stereo speakers only when radio is turned on. just bought the car have not talked to a shop yet. thanks for your time. also does any body know what the oil temp should run at hot?? is 240 degrees hot??
Hissing soud is from the altenator ( not a big deal ) have a noise reducer installed or have the stereo rewired for it's power wire from a different location. Very common thing that happens by do it your selfers.
As for oil temp I'm not sure what it should be on thatcar but is it oil tem or oil pressure?
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it could be antennae, you should hear a hiss in the speakers when you turn it up to halfway. if there is no hiss it is possible a broken connection to speakers or a blown fuse for the speakers in the car.
1989 Dodge Ram 50 Car Audio Wire Harness Color Guide
Car Radio Battery Constant 12v+ Wire: Red
Car Radio Accessory Switched 12v+ Wire: Red/White
Car Radio Ground Wire: Black
Car Radio Illumination Wire: N/A
Car Stereo Dimmer Wire: Orange/White
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Green
Left Front Speaker Negative Wire (-): Green/Yellow
Right Front Speaker Positive Wire (+): Violet
Right Front Speaker Negative Wire (-): Violet/Yellow
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Brown/Yellow
Right Rear Speaker Positive Wire (+): Blue/Red
Right Rear Speaker Negative Wire (-): Blue/White
its interference from the alternator ,for whatever reason which i think is your problem but i could be wrong it could just be the radio has damp inside it and may dry out with use like have the heater on ,without hearing the noise its difficult to pinpoint exactly what the noise is ,yes their is a difference in the type of noise as to a clue as to what is causing the noise .
1989 Plymouth Sundance Car Stereo Radio Wiring Diagram.
Car Radio Constant 12V+ Wire: Pink Car Radio Switched 12V+ Wire: Red/White Car Radio Ground Wire: Back Strap Car Radio Dimmer Wire: Orange/White Front Speakers Size: 5 1/4? Front Speakers Location: Doors Left Front Speaker Wire (+): Green Left Front Speaker Wire (-): Green/Yellow Right Front Speaker Wire (+): Purple Right Front Speaker Wire (-): Purple/Yellow Rear Speakers Size: 5? x 7? Rear Speakers Location: Side Shelves Left Rear Speaker Wire (+): Brown Left Rear Speaker Wire (-): Brown/Yellow Right Rear Speaker Wire (+): Blue/Red Right Rear Speaker Wire (-): Blue/White