Problem with 1990 Grand Prix radio
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=36407
Printed Date: May 16, 2024 at 1:55 AM
Topic: Problem with 1990 Grand Prix radio
Posted By: tabbruzz
Subject: Problem with 1990 Grand Prix radio
Date Posted: July 29, 2004 at 1:18 PM
I have a problem that I think is the radio or amp(if there is one). The problem is that after a few minutes I get loud cracking sounds coming from my pass side speakers. It renders the radio useless. What could this be??? How can I test the radio to see if its bad or not? Thanks Tony
Replies:
Posted By: sparkie
Date Posted: July 29, 2004 at 1:40 PM
The problem may be a short in one of the speaker circuits. Remove the radio from the dash, butdon't unplug it. When the problem occurs, use a digital meter to measure the DC voltage on each speaker wire. Place your meter on a 12 volt DC scale and measure between a good ground and each speaker wire output. The speaker out wires are in two differnet spots in the plug. The rear speaker wires are brown, yellow, light blue, and dark blue. The front speaker wires are light green, dark green, tan and grey. These wires should have about 6 volts on them with the radio on. If they don't then either that speaker wire/wires needs to be replaced or the speaker is bad. If everything checks OK, then the problem is likely in the radio. You may also be able to lightly tap the radio with a screwdriver to see if the problem is a bad connection in the radio. A lot of radio shops can also test the radio if you are unsure
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sparky
Posted By: tabbruzz
Date Posted: July 29, 2004 at 1:45 PM
If there is a short in one speaker can it affect the other ones? All of my pass side speakers make the noise, not just one of them. Caould it be an amplifier problem?
Posted By: sparkie
Date Posted: July 29, 2004 at 2:11 PM
The problem could be a short in one or more of the wires to the right side speakers. If one wires is shorted more may be too. They do run along the same paths at times in the car. Try what I mentioned and I am sure you will locate the cause of the problem. If any one of the speaker wires shorts to ground or 12 volts, all the audio will cut out from the radio.
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sparky
Posted By: tabbruzz
Date Posted: August 02, 2004 at 8:35 AM
Sparky, I tested the radio as you mentioned. I got 5-6 volts on 4 of the wires and 2-3 volts on the dk green and one of the other colors. Does this indicate a bad speaker or wiring? Thanks, Tony
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