Blown switched ignition fuse, where to look?

Alstann · 05-22-2013, 07:51 PM

I accidentaily touched my remote turn on wire from the radio (for subwoofers, etc.) to the frame while the car was on, and it blew a fuse or something.

Thing is, I checked all of my fuses - I couldn't find one blown fuse. Is there something I'm missing? I'm frustrated to the point I want to drive the car to the dealership and pay to have it fixed.

bigaudiofanat · 05-22-2013, 07:57 PM

Check your head unit fuse, and if the radio still will not power on check the radio fuse under the dash. Did you check to see if your still getting power to the head unit? Is it powering on?

Alstann · 05-22-2013, 08:08 PM

Quote:

Originally Posted by bigaudiofanat

Check your head unit fuse, and if the radio still will not power on check the radio fuse under the dash. Did you check to see if your still getting power to the head unit? Is it powering on?

I don't have a head-unit per-se; I have a CarPC with a PC mounted in the trunk, and a Monitor where the head unit would be.

My ignition turn on wire feeds 5 devices: My wideband gauge, my monitor, my subwoofer amp, my 4channel amp, and my car computer. The reason it blew out was because I drove around with the subwoofer amp's turn on wire exposed, and it touched the frame.

I heard a click, and then all those electronics turned off. I know that the individual fuses to each device didn't blow, because my wideband did a closing ceremony, indicating that it still had +12 power, but it lost the ignition signal.

I checked all of the fuse boxes, though, and I can't find anything!

iceman21_23 · 05-22-2013, 08:11 PM

all three fuse boxes?

Alstann · 05-22-2013, 08:22 PM

Quote:

Originally Posted by iceman21_23

all three fuse boxes?

Yep, all three, including the vertically mounted one.

iceman21_23 · 05-22-2013, 08:28 PM

the power supply still working on your car pc? may have flipped the fuse on that ( i know a few powersupplies have a built in fuse.)

bigaudiofanat · 05-22-2013, 08:39 PM

Quote:

Originally Posted by Alstann

I don't have a head-unit per-se; I have a CarPC with a PC mounted in the trunk, and a Monitor where the head unit would be.

My ignition turn on wire feeds 5 devices: My wideband gauge, my monitor, my subwoofer amp, my 4channel amp, and my car computer. The reason it blew out was because I drove around with the subwoofer amp's turn on wire exposed, and it touched the frame.

I heard a click, and then all those electronics turned off. I know that the individual fuses to each device didn't blow, because my wideband did a closing ceremony, indicating that it still had +12 power, but it lost the ignition signal.

I checked all of the fuse boxes, though, and I can't find anything!

That's a big no no! That many devices you should have a relay setup!!!.

Alstann · 05-22-2013, 09:34 PM

Quote:

Originally Posted by iceman21_23

the power supply still working on your car pc? may have flipped the fuse on that ( i know a few powersupplies have a built in fuse.)

Just checked it, it looks all good from here. I also checked the amp fuses, and the monitor fuse, and it's all good.

Quote:

Originally Posted by bigaudiofanat

That's a big no no! That many devices you should have a relay setup!!!.

Haha, I told myself that too. I don't think it's drawing lots of current though, since it's a signal wire, not the main +12 rail. I use a distribution block in the car for the 5 devices, and they are fed from the battery with 2GA wire.

Alstann · 05-22-2013, 10:46 PM

I'm so dumb.

The audio fuse was blown and I didn't see it, 4 times.

Thanks guys.

SouthArk370Z · 05-23-2013, 12:28 AM

Quote:

Originally Posted by Alstann

...The audio fuse was blown and I didn't see it, 4 times. ...

How are you checking your fuses? If you missed it 4x, I'm guessing you were using a visual check which, as you have discovered, doesn't always work so well. Invest in a multimeter (VOM) or test light. You can find cheap meters for $10-20 or so and a test light ought to be half that. It will save a lot of

s next time.

Alstann · 05-23-2013, 10:16 AM

Quote:

Originally Posted by SouthArk370Z

How are you checking your fuses? If you missed it 4x, I'm guessing you were using a visual check which, as you have discovered, doesn't always work so well. Invest in a multimeter (VOM) or test light. You can find cheap meters for $10-20 or so and a test light ought to be half that. It will save a lot of

s next time.

That's actually how I found it - I used my multimeter. I was too impatient and didn't feel like finding one of my 5 harbor freight multimeters they give away for free.

Chalk that up to laziness!

SouthArk370Z · 05-23-2013, 10:57 AM

Quote:

Originally Posted by Alstann

That's actually how I found it - I used my multimeter. I was too impatient and didn't feel like finding one of my 5 harbor freight multimeters they give away for free.

Chalk that up to laziness!

Been there. Done that. Carry on.

Mitco39 · 05-23-2013, 03:39 PM

I actually did the same thing this spring. Then you scare yourself thinking something is really fried. haha.

05-22-2013, 07:51 PM	#1 (permalink)
Alstann Track Member Join Date: Oct 2011 Location: South Florida Posts: 882 Drives: 12 PW 370z 6MT Sport Rep Power: 15	Blown switched ignition fuse, where to look? I accidentaily touched my remote turn on wire from the radio (for subwoofers, etc.) to the frame while the car was on, and it blew a fuse or something. Thing is, I checked all of my fuses - I couldn't find one blown fuse. Is there something I'm missing? I'm frustrated to the point I want to drive the car to the dealership and pay to have it fixed. __________________ 2012 Pearl White 370Z GReddy Twin Turbo

05-22-2013, 07:57 PM	#2 (permalink)
bigaudiofanat Car Audio Installer Join Date: Jun 2009 Location: Magnolia DE Posts: 8,342 Drives: 2012 Infiniti G37x Rep Power: 853	Check your head unit fuse, and if the radio still will not power on check the radio fuse under the dash. Did you check to see if your still getting power to the head unit? Is it powering on? __________________ Need help with car audio or electronics? Let me know!! Need Help Let Me Know Direct email address reimermatt@gmail.com Owner of: Dynamic Mobile Audio Follow me below https://www.facebook.com/Dynamicmobileaudio/

05-22-2013, 08:11 PM	#4 (permalink)
iceman21_23 Track Member Join Date: Jan 2009 Location: league city, tx Posts: 757 Drives: 09' Solid Red 370z Rep Power: 17	all three fuse boxes? __________________ Zele front bumper cf front lip, Seibon TS Hood, Work GS2, Ings+1 side skirts Takeda CAI Litespeed Exhaust

05-22-2013, 08:28 PM	#6 (permalink)
iceman21_23 Track Member Join Date: Jan 2009 Location: league city, tx Posts: 757 Drives: 09' Solid Red 370z Rep Power: 17	the power supply still working on your car pc? may have flipped the fuse on that ( i know a few powersupplies have a built in fuse.) __________________ Zele front bumper cf front lip, Seibon TS Hood, Work GS2, Ings+1 side skirts Takeda CAI Litespeed Exhaust

05-22-2013, 10:46 PM	#9 (permalink)
Alstann Track Member Join Date: Oct 2011 Location: South Florida Posts: 882 Drives: 12 PW 370z 6MT Sport Rep Power: 15	I'm so dumb. The audio fuse was blown and I didn't see it, 4 times. Thanks guys. iceman21_23 likes this. __________________ 2012 Pearl White 370Z GReddy Twin Turbo

05-23-2013, 03:39 PM	#13 (permalink)
Mitco39 A True Z Fanatic Join Date: Aug 2012 Location: Edmonton Alberta Canada Posts: 2,089 Drives: 40th 370z Rep Power: 132	I actually did the same thing this spring. Then you scare yourself thinking something is really fried. haha. __________________ 2007 Chevy Duramax - EFILive Tuned By Me 2010 40th W/ Nav - Boosted Performance - UpRev Tuned By Me The Mrs. Ride -2012 335XI N55 BMW - Cobb Tuned By Me, Built by her My Build --> http://www.the370z.com/members-370z-...39s-build.html

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