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=70255
Printed Date: May 13, 2024 at 3:07 AM
Topic: Blowing Fuses
Posted By: mashman
Subject: Blowing Fuses
Date Posted: January 07, 2006 at 12:51 PM
Hey Guys, Im having a little troiuble with my audio system, hopefully someone can tell me whats up. Ive recently gotten a new car and transfered my subs, amp, and head unit over. I got a new wiring kit and set up everything exactly the same as I had in my old car (which was installed for close to a year without any probs.) I am currently running two Sony XS-L1090 P5 (10" 5sided aluminum cone subs with a 1200w peak and 400w RMS) off of a Sony Head Unit with a 1.2 farad cap. For some reason I keep blowing fuses. The system worked fine for about 6 weeks and then blew my in-line 30amp fuse. I checked my grounds and replaced it with a 40amp fuse. After about 5 days it blew the new fuse. This time I redid my grounds to what I am positive are better ground sites. Again my fuse blew. At this point Im not sure what could be the problem, I am almost positive there is no short to groud on the power line. Im not really eager to take it apart and start from scratch, so short of that, does anyone have any ideas or suggestions??? Thanks a lot guys. Matt
Replies:
Posted By: forbidden
Date Posted: January 07, 2006 at 1:04 PM
If you have a meter, set it to check for continuity. Take out the fuse, then remove the power wire from the amp. Meter the power line, put one probe on ground and the other on the fuse end of the power line, if you are getting continuity, then you have a dead short in the wire. Is the size of the main fuse as large or larger than the size of the fuse in the amplifier?
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Top Secret, I can tell you but then my wife will kill me.
Posted By: DYohn
Date Posted: January 07, 2006 at 1:06 PM
Blowing fuses is a symptom of an electrical problem, so your only option is to take it apart and start from scratch. You obviously either shorted something out or damaged wiring in some way. Of course it is possible that the equipment has simply fried and gone to Sony heaven, which I believe is somewhere in Canada, probably in the NW Territories. Sony car audio gear is not very reliable. Oh, and one other point: NEVER simply replace a blown fuse with a larger rated fuse! This is unwise and unsafe and is asking for a fire. ------------- Support the12volt.com
Posted By: forbidden
Date Posted: January 07, 2006 at 1:28 PM
Ah no, Sony heaven is actually in Oklahoma..... man trying to give Canadians a bad name....sheesh. The main power wire fuse is there to protect the vehicle from a catastrophe, it needs to be as close to the same rating as the combined value as the fuses in the amp(s). Do not replace the fuses in the amp(s) with fuses of larger ratings. ------------- Top Secret, I can tell you but then my wife will kill me.
Posted By: DYohn
Date Posted: January 07, 2006 at 2:40 PM
forbidden wrote:
Ah no, Sony heaven is actually in Oklahoma..... man trying to give Canadians a bad name....sheesh.
You know, I thought I saw it once high up in the British Columbia rain forest... a big huge pile of steaming Sony... but that could have been due to my alcohol induced state.  ------------- Support the12volt.com
Posted By: forbidden
Date Posted: January 07, 2006 at 3:55 PM
No, no, you were right. It was deemed to be a toxic biohazard that we had to pay millions of dollars to clean up, that's when Oklahoma stepped up to plate to take this toxic waste in, seems that they thought they could refurb the stuff and sell it on E-Burn.
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Top Secret, I can tell you but then my wife will kill me.
Posted By: surfngroovin
Date Posted: January 07, 2006 at 6:03 PM
There are three 40amp fuses on the amp, the switch to the 40amp inline fuse was for that reason. Thanks for the help guys...I'll check it out.
Posted By: DYohn
Date Posted: January 07, 2006 at 10:17 PM
surfngroovin wrote:
There are three 40amp fuses on the amp, the switch to the 40amp inline fuse was for that reason. Thanks for the help guys...I'll check it out.
Oh? Meaning the amp is designed to draw up to 120 amps? No wonder you blew anything smaller. Might have been nice to know that. Make and model numbers, etc. You said you were running subs off a head unit... An amp pulling more than 100 amps needs 4 gauge power and ground cable and a 150 amp fuse or circuit breaker at the battery, and a high-output alternator. ------------- Support the12volt.com
Posted By: mashman
Date Posted: January 08, 2006 at 1:09 PM
The Amp is a Sony Xplod xm-D1000p5...Sorry must have deleted that in the original post. I do have a 4 gauge power and ground running through a 1.2 farad cap to it.
Posted By: DYohn
Date Posted: January 09, 2006 at 10:31 AM
That amp is rated at 500 watts into 4 ohms or 900 watts into 2 ohms. Of course it will blow a 30 or 40 amp fuse. If you are using 4-AWG power and ground cable, fuse the system for the cable's capacity at the battery (up to 150 amps.) ------------- Support the12volt.com
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