Car Stereo Question.

[Steve69]

Hi Guys

I rewiring some new gauges and thought it would be a good time to get rid

of the cassette deck from the 1980s. Im running a alpine Amp and the

problem Im having is a pulsating noise through the speakers when the the

Blinkers are on or the Hazzard lights. It does this with the stereo off or on

and with the car Running and when its not running. Im replacing the Head

unit with a new unit so I wanted to figure out what this problem is before I

start.

Thanks
Steve69

 

[wild70stang]

I have a CD player in my 70 mustang and I dont hear any pulsating noise. I wonder if your wires might be crossed or mounted wrong. I will get back later if I come up with anything.

 

[wild70stang]

Actually I did have a similar problem. Are you using the factory speakers? if so its the watts from the new stereo that is overloading the speaker. If its new, then it may be that your amplifier is failing. Also check to make sure ur system is grounded properly.

 

[iskwezm]

the noise your hearing is not over load the speakers, you have RFI(radio frequency interference),check your grounds,then you might have to add a RCA ground loop isolator because your amp is making the noise louder,try thsese.If it was a noise tha goes with RPM,then your RCA are picking up noise.

 

[ForceFed70]

If your hearing noise with the stereo off, you have wiring issues.

The amp should only be on when the stereo is on.

That asside, you'll probably still have noise issues. My guess is that your stereo does not have a good ground or power connection. Run dedicated 16ga (or better) wires for ground and power (power directly to fuse block or battery, ground to a good chasis ground...not some metal piece in your dash.

If your wiring is good, then it's probably the head unit causing problems. Likely because of old worn out capacitors in the power filtering circuits. You might try an inline power filter...or a new head unit.

 

[Steve69]

thanks for the input.

Ill check my grounds and my connections. The head unit is a cheap Road Gear Cassette Deck so that could be some of the problem.

Thanks
Again
Steve69

 

[iskwezm]

thanks for the input.

Ill check my grounds and my connections. The head unit is a cheap Road Gear Cassette Deck so that could be some of the problem.

Thanks
Again
Steve69

well damn,you never mentioned that,that probably used SS circuitryamnit:

 

[67CoupeDriva]

I've seen several mentions of ground problems, which I would suspect. Also there is a condition called "ground loop" in which you have different components grounded at different places (i.e., deck to the dash, amp to somewhere in the trunk). This can sometimes cause a problem if the the quality of the two grounds is not the same and they offer different resistance.