Blowing fuses!
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=57414
Printed Date: May 10, 2024 at 6:19 AM
Topic: Blowing fuses!
Posted By: teklife256
Subject: Blowing fuses!
Date Posted: June 10, 2005 at 1:45 AM
Well, I have a Pioneer DEH-1500 that I am trying to install in a '93 Mazda B2200. Everything was great until I realized that the wiring harness that cam with the stereo did not have the inline fuse attached for the 12V constant. So, I just reused the inline fuse that was attached to the previous stereo in the truck. When I power up the stereo it starts for a minute until I try to insert a CD when the stereo dies and blows the 32V .5A inline fuse that is attached to the 12V constant wire. My question is this, what are the fuse ratings for this stereo and vehicle for the 12V constant and the switched inline fuse? Or is there a universal rating that is obviously greater than .5A? I really need your expert help, I know I am a newbie but I just want some music while commuting. Can you help a guy out? Thanks.
Replies:
Posted By: dwarren
Date Posted: June 10, 2005 at 2:20 AM
More than likely it is a 10 amp fuse. You may be able to find that info out at pioneer's web page.
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Posted By: teklife256
Date Posted: June 10, 2005 at 7:35 AM
That is the thing, I have been to the Pioneer site and spent alot of time looking there as well as other web sites. You can understand that I do not want to damage my new radio due to my lack of experience with these things. Hopefully, someone can help me out here. I have been singing to myself and getting some crazy looks on the road.
Posted By: Blowntweeters
Date Posted: June 10, 2005 at 9:39 AM
i would just try a 10 amp fuse should not hurt the head unit i have put 40 amps of power to a head unit in my early years was not trying to do it but i did anyway i just made the unit work very fast so i dont think a 10 amp will hurt any thing and is just the constant your having this problom with ???? ------------- 1974 ford pinto 4 15" punch Z power punch bd 1001 pioneer DEH-6700
Posted By: samroza
Date Posted: June 10, 2005 at 10:05 AM
Most manufacturers use 10A for their fuses. Even car manufacturers generally wire in a 10A fuse for the HUs.
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Sam Roza
Posted By: teklife256
Date Posted: June 10, 2005 at 5:07 PM
It is just the constant that I am having problems with at the moment as I have blown several .5A inline fuses. I would have expected the Pioneer site to be more helpful, perhaps I need to try a 2A and increase until the fuse stops blowing. That seems somewhat logical until I can get a definitive answer. I know this seems very rookie-like but I just want to rock out again in my little mazda.
Posted By: DYohn
Date Posted: June 10, 2005 at 10:18 PM
If you refer to page 19 of the Pioneer DEH-1500 owner's manual it states the max current draw is 10 amps. Use a 10 or 12 amp fuse. This deck (and most decks) SHOULD immediately blow a 0.5a fuse. ------------- Support the12volt.com
Posted By: kgerry
Date Posted: June 11, 2005 at 11:55 AM
in the "old" days the B/U lead was used primarily for maintaining memory for the clock and radio presets... that was this circuits sole function... nowadays, more often than not the B/U circuit provides VCC to the output stage which is powered all the time and simply goes into a "wait state" until it sees ACC power again... this means that the B/U circuit is now the power supply for the entire radio and as such requires far more current handling.... 10-15 amps vs. the 100-500 ma it used to require.....
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Kevin Gerry
Certified Electronics Technician
MECP First Class Installer
Owner/Installer
Classic Car Audio
since 1979
Posted By: teklife256
Date Posted: June 11, 2005 at 2:49 PM
Well, I think I have bigger problems now. I installed the 5A fuse for the constant and listened to a CD for about a half hour when it began to screech. I immediately shut it off and disconnected the wiring harness. After inspecting the fuses and wiring which appear to be correct I powered the unit back up. Now when I increase the volume past level 0 the unit screeches and the power cycles about every 2-3 seconds. I don't get any music out of the speakers and when I disconnect the speakers the unit is still screeching although much quieter. If I didn't know any better I would say that a capacitor is discharging. What is up with this unit??!!! HELP!!
Posted By: Alpine Guy
Date Posted: June 11, 2005 at 3:32 PM
Disconnect your ground from your factory wire harness and find a nice chunk of metal behind the dash , put your wire in a o-ring crimp on connector and secure it to the metal with a already existing bolt. But be shure to give the metal a quick sand with some sand paper. Hopefully that should be your only problem.
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2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.
Posted By: teklife256
Date Posted: June 11, 2005 at 3:48 PM
I read that somewhere before and have tried that. Aside from the capacitor being bad what could cause this?
Posted By: DYohn
Date Posted: June 11, 2005 at 8:31 PM
... and make sure you have at least 4-ohm loads on each channel. ------------- Support the12volt.com
Posted By: Scuba_04
Date Posted: June 12, 2005 at 12:57 AM
10A
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Steve
Music Mart
Installer
Posted By: Bumpin' Yota
Date Posted: June 12, 2005 at 8:25 AM
I've installed literally dozens upon dozens of HUs.....never heard of one 'screeching' before..... This sound is eminating from the deck itself and not the speakers? ------------- 2x dB Drag World Finalist
2003 Nopi Nat. Street B champ
2004 SBN Street C champ
2004 SBN Advncd NW Champ
2004 Former WR Holder in NW
In loving memory of Jamie Riggs 5/15/85 - 10/8/04
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