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What is best way to find a ground short in big truck?

When you key up cb radio, it causes loud squeal in am/fm radio speaker.

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  • 193 Answers

What type of truck. Some of the newer trucks use the "cb" antennas for am/fm and tv. In this case i ran a separate coax to the passenger side antenna mount. This was in a Volvo 660.

Posted on Dec 06, 2012

  • Bob Hume Feb 04, 2013

    Thanks, I got rit of the truck. Cured my problem..

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Posted on Jan 02, 2017

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  • 84 Answers

SOURCE: Speakers squeal even when radio is off. I removed

bad ground wire

Posted on Oct 03, 2009

bridgesdean7
  • 41 Answers

SOURCE: Mt Audi A6 1999 am radio has a loud squeal.

sound like a speaker wire is grounding out somehow

Posted on Jun 03, 2009

luckyluke78
  • 333 Answers

SOURCE: 1989 Chevy Truck , Stock Radio , Whining noise

Sounds like you have a capacitor problem.It could be a number of issues , but i suggest you check the alternator one first.

If you unplug the power cable to the back of the alternator and the whining goes away then replace the capacitor(usually only one bolt/screw)and you should be OK.

If not I sometimes have dissconnected the + wire from the HT coil when the car is running and the same applies,and if this works replace the capacitor or fit one if there isn't.

If none of this helps fit one to the + wires of your radio.

Please leave fair comment if I have helped you.

Thank you

Posted on Sep 01, 2009

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Having trouble with all my speakers except my twitters in a 2007 Saturn Outlook...what do I start with? Fuses are good


Speakers get power from the amp if your system has one or from the radio , if the tweeters work it's not a fuse problem . You like listen to your stereo loud . Blew a channel in the radio or amp ?
Take it and have it checked for DTC'S - diagnostic trouble codes
DTC B1025 01: Audio Output 1 Left Front Circuit Short to Battery
DTC B1025 02: Audio Output 1 Left Front Circuit Short to Ground
DTC B1035 01: Audio Output 2 Right Front Circuit Short to Battery
DTC B1035 02: Audio Output 2 Right Front Circuit Short to Ground
DTC B1045 01: Audio Output 3 Left Rear Circuit Short to Battery
DTC B1045 02: Audio Output 3 Left Rear Circuit Short to Ground
DTC B1055 01: Audio Output 4 Right Rear Circuit Short to Battery
DTC B1055 02: Audio Output 4 Right Rear Circuit Short to Ground

Each of the audio output channel circuits (+) and (-), at the radio and audio amplifier (if equipped) have a DC bias voltage that is one half of the battery voltage. When using a DMM, each of the audio output channel circuits will measure approximately 6.5 V DC. The audio being played on the system is produced by a varying AC voltage that is centered around the DC bias voltage on the same circuit. The AC voltage is what causes the speaker cone to move and produce sound. This voltage will vary depending on what type of audio is being listened to, talk or music, and type of music, as well as the volume setting of the system. Low volume and talk settings will measure around 1V AC and less, where constant music may measure 3 V AC and slightly higher.
Do you know how to do DC voltage testing ?
Without Amplifier without UK6
Ignition OFF, disconnect the harness connector at the appropriate speaker.
Radio ON, test for 5.0-7.5 V between the signal circuit terminal A and ground.
? If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
? If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
Test for 5.0-7.5 V between the signal circuit terminal B and ground.
? If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
? If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
If all circuits test normal, replace the speaker.

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1 Answer

2002 Mitsubishi Montero Sport Alternator is fine and starter is too. New battery. Former owner started having problems after putting in a new radio. What could make my battery not stag charged


Apparently there is a "dead short" that is draining the battery. If a power wire or connection (plus side) is in contact with a ground wire or source this will create a short that drains the battery. When the battery is charged feel the wires and all connections to the radio and you may feel heat from the bad connection. Best bet is disconnect the entire set up and start over. It is best if the wires stay color coded (if you replace any). This dead short could cause a fire or damage any other wiring it is connected to. If the prior owner ran a new wire from the battery make sure those connections are tight and not rubbing any bare wires that could touch a ground source. (Most metal parts in vehicles are connected to the ground side of the battery. Also check your speaker connections from the unit to each speaker. Those wires can not touch each other or any metal. I hope this helps.

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1 Answer

AM FM radio Compact Disc player o.k. for 30 sec after start, then nothing. Fuses o.k.


Maybe a shorted speaker causing the power amplifier inside the radio to shut down or a speaker wire shorted to chassis and last the internal amplifier of the radio cd set faulty by itself... set volume to zero power it off take out the radio cd set; remove the speaker iso plug leaving the power plug only in and power it on if necesary turn again the volume down to zero and wait if it keeps turned on it a speaker problem if it shut itself off again then you go for a repair or a new one

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1 Answer

Short in electrical system?


when the radio is OFF sound comes out of the rear speakers when the blinkers are used ! There isn't a turn signal flasher on your vehicle ,( like most all newer vehicles ) It's done electroniclly by a control module . In the case of your vehicle , the BCM - body control module . It doesn't matter if the radio is off . All the Audible warnings come out of the radio speakers . Headlamps left on , key in ignition etc... You have no idea of the complexity of your vehicle , it's a rolling computer , with a serial data network for the modules to talk to each other , share info.
When the turn signal switch is placed in either the left or right position, a ground signal is completed from the turn signal switch to the BCM. When the hazard flasher switch is activated, a ground signal is completed from the turn signal/hazard switch to the BCM. The BCM then sends an ON-OFF voltage signal through the fuses to the appropriate turn signal and side repeater (export only) lamps or to all of the turn signal fuses for hazard operation.
Really don't think you have electrical short . Computer glitch maybe , radio problem . How ever , these system's are not for the untrained to mess with . Your best bet , the GMC dealer !

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Radio sound problems , sound comes and goes , but mostly , goes


You are not the only one with this problem... Alot of 01' impalas had problems with the radio. You could take it out to see if there are any loose wires or something grounding out but if it was me I would upgrade to a CD player that has bluetooth and Aux input and some of the newer stuff with it. Also don't foget that it is possible that at or between the speaker connection there could be a short or something grounding out to cause the problem. But no matter what, the dash has to come off so why not put in a new one while you are in there getting your hands dirty. Also Wal-Mart sells a dash kit for every year car/truck but please install it your self don't go and get ripped off by best buy or one of these hole in the wall stereo places. P.S. Take Off The Battery Terminals Before You Do Anything!!!!!!!

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Have a random popping sound coming from car speakers. Sometimes its just from the front right door speaker sometimes its from all the speakers, pops range in loudness levels, the loudest pop comes from the...


Is it after market radio? Check connections from radio to speakers and at the speaker(s) Door slamming knocks wiring loose. Also bad antenna lead can do it also since most radios get ground from antenna.

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sound like a speaker wire is grounding out somehow

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your speaker is burnt out , see an auto electritian cos your car has just short cucuited and is very danderous the whole car could catch fire,

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