my radio keeps going off

jughead · November 16th, 2010, 06:53 PM

hi can anyone help me . i have a 1987lx convertible i just changed my pullys, and when i slow down my radio keeps going off then a few seconds it comes back on agian. i bought the car in californa, i'm from ny. it has an after market radio in it. it used to shut off once in awhile but it really does it now ever time i start putting on my brakes and slowing down. also my stock temp gauge keeps moving up and down it'll go to the o and then onnce i'm driving for a while it'll go to the red. then it'll go back to the middle,but it never stays still. i can sit there and turn my lights on and the gauge moves it up then when i shut off my lights it'll go down. do i have a short somewhere and if so how do i find it thanks, please help me.

FastStang91Lx · November 16th, 2010, 07:15 PM

I think you have a ground issue. I believe you need you get your head up under the dash and start redoing all the grounds under the screws. Scrape the metal before you put the ground ring (or fork) back on. Look around, there is a few.

AdderMk2 · November 16th, 2010, 08:12 PM

put your stock pullies back on, get your alternator and battery tested

steve86gt · November 16th, 2010, 08:17 PM

it sounds like something is wrong w/the charging system, but test the battery anyway. It may also be an issue with the stereo ground itself. My guages do funny shit too. Probably bad grounds behind the dash, or some voltage regulation problem.

95tbirdv8 · November 16th, 2010, 11:55 PM

It's probably the charging if it only shuts off at lower rpms. When you put the underdrive pulleys it makes the Alternator turn slower. Therefore less voltage. If your Alternator was already weak, its even weaker now. Get it tested like mentioned above.

FastStang91Lx · November 17th, 2010, 12:21 AM

Do all of the above. If you had weak grounds, weak alternator, weak battery, etc.... the problem is only going to be magnified by the use of underdrive pulley's. March Power and Amp series are the only way to go...

jughead · November 17th, 2010, 07:16 PM

hey thanks for the replie the battery is only 4 months old, i took my tester out and it's fully charged, i think the alternator is the original one, should i replace it or check the voltaged alternator, i don't know where that is, could somebody tell me how to check that.

ryanw · November 17th, 2010, 07:50 PM

take your alternator to have it checked at the auto parts store they will do it for free

95tbirdv8 · November 17th, 2010, 10:18 PM

Turn the car on, and unplug the battery. If the car dies your Alternator is bad.

AdderMk2 · November 18th, 2010, 12:50 AM

Originally Posted by 95tbirdv8

Turn the car on, and unplug the battery. If the car dies your Alternator is bad.

Dont ever do this. It can cause a power surge in the alternator that can not only fry the internal electronics of the alternator itself, but possibly some of the electronics in the car itself (like your ECM)

marshall88lx · November 18th, 2010, 09:59 AM

+1 on not doing that ^ and get it done for free or if you have a multi-meter you can simply check it!

November 16th, 2010, 06:53 PM	#1
jughead Newbie Join Date: Nov 2010 Posts: 2 iTrader: 0 reviews	my radio keeps going off hi can anyone help me . i have a 1987lx convertible i just changed my pullys, and when i slow down my radio keeps going off then a few seconds it comes back on agian. i bought the car in californa, i'm from ny. it has an after market radio in it. it used to shut off once in awhile but it really does it now ever time i start putting on my brakes and slowing down. also my stock temp gauge keeps moving up and down it'll go to the o and then onnce i'm driving for a while it'll go to the red. then it'll go back to the middle,but it never stays still. i can sit there and turn my lights on and the gauge moves it up then when i shut off my lights it'll go down. do i have a short somewhere and if so how do i find it thanks, please help me.

November 16th, 2010, 07:15 PM	#2
FastStang91Lx I Post Entirely Way Too Much 1991 Mustang LX 5.0 Join Date: Jan 2010 Location: Minnesota Posts: 5,572 iTrader: 2 reviews	I think you have a ground issue. I believe you need you get your head up under the dash and start redoing all the grounds under the screws. Scrape the metal before you put the ground ring (or fork) back on. Look around, there is a few. __________________ Point made in less than a few hours with minimal response. http://www.moddedmustangs.com/forums...ml#post4465184

November 16th, 2010, 08:12 PM	#3
AdderMk2 Banned Join Date: Aug 2007 Location: al-Ahhmadi, Kuwait Posts: 991 iTrader: 0 reviews	put your stock pullies back on, get your alternator and battery tested __________________ [URL="http://providence.craigslist.org/cto/2148862880.html"]1994 Cobra For Sale[/URL] [SIGPIC][/SIGPIC] [QUOTE=Timm10221]Its only a 10 inch Tach that sits right in the center of the dash with LED lights and a Spinner bezel that has dimonds and gold plating.. And when you hit 4500 plus is sounds off (AAHHH SHITT) :cool:[/QUOTE]

November 16th, 2010, 11:55 PM	#5
95tbirdv8 Enthusiast 1990 mustang gt Join Date: May 2010 Location: houston, tx Posts: 627 iTrader: 0 reviews	It's probably the charging if it only shuts off at lower rpms. When you put the underdrive pulleys it makes the Alternator turn slower. Therefore less voltage. If your Alternator was already weak, its even weaker now. Get it tested like mentioned above. __________________ Burning Rubber in the 5.0 http://www.youtube.com/watch?v=mKGSmRkKQcM95 95 mark8 lsc 95 tbird v8 90 mustang gt 07 silverado v8 08 yamaha r6 to be continued........ foxbodyperformance.com is the way to go

November 17th, 2010, 12:21 AM	#6
FastStang91Lx I Post Entirely Way Too Much 1991 Mustang LX 5.0 Join Date: Jan 2010 Location: Minnesota Posts: 5,572 iTrader: 2 reviews	Do all of the above. If you had weak grounds, weak alternator, weak battery, etc.... the problem is only going to be magnified by the use of underdrive pulley's. March Power and Amp series are the only way to go... __________________ Point made in less than a few hours with minimal response. http://www.moddedmustangs.com/forums...ml#post4465184

November 16th, 2010, 08:17 PM	#4
steve86gt Newbie 86 Mustang GT Join Date: Jul 2010 Location: Provo, UT Posts: 20 iTrader: 0 reviews	it sounds like something is wrong w/the charging system, but test the battery anyway. It may also be an issue with the stereo ground itself. My guages do funny shit too. Probably bad grounds behind the dash, or some voltage regulation problem.

November 17th, 2010, 07:16 PM	#7
jughead Newbie Join Date: Nov 2010 Posts: 2 iTrader: 0 reviews	radio shuts off hey thanks for the replie the battery is only 4 months old, i took my tester out and it's fully charged, i think the alternator is the original one, should i replace it or check the voltaged alternator, i don't know where that is, could somebody tell me how to check that.

November 17th, 2010, 07:50 PM	#8
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	take your alternator to have it checked at the auto parts store they will do it for free __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

November 17th, 2010, 10:18 PM	#9
95tbirdv8 Enthusiast 1990 mustang gt Join Date: May 2010 Location: houston, tx Posts: 627 iTrader: 0 reviews	Turn the car on, and unplug the battery. If the car dies your Alternator is bad. __________________ Burning Rubber in the 5.0 http://www.youtube.com/watch?v=mKGSmRkKQcM95 95 mark8 lsc 95 tbird v8 90 mustang gt 07 silverado v8 08 yamaha r6 to be continued........ foxbodyperformance.com is the way to go

November 18th, 2010, 09:59 AM	#11
marshall88lx Newbie 88 Mustang lx Join Date: Apr 2010 Location: Millbrook,al Posts: 43 iTrader: 0 reviews	+1 on not doing that ^ and get it done for free or if you have a multi-meter you can simply check it!

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