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Old 07-16-2019, 12:15 AM   #1
MortonCharbo
Scooby Newbie
 
Member#: 487057
Join Date: Jun 2018
Chapter/Region: BAIC
Location: California
Vehicle:
2002 WRX Wagon
PSM

Default Horn/hazard fuse pops as soon as I plug it in.

I installed sharptones and they worked until I went out for a drive. I checked the fuse and sure enough, it was blown. Put another in. Tested it and it worked. As soon as I started the engine, that fuse popped.

Now as soon as the fuse makes contact with the socket, pop! First off, I don't know what caused the behavior to change slightly. Second off, I don't know what's causing the problem in the first place.

I wired the relay using a combination of instructions I found on different forums. I've checked my wiring, and the existing wiring, and couldn't find any pinches or shorts.

I read somewhere that the relay may be mislabeled. Is this true? I can't find the thread that mentioned it.
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Old 07-16-2019, 07:29 AM   #2
rtv900
Scooby Specialist
 
Member#: 428511
Join Date: Aug 2015
Location: philadelphia
Vehicle:
2016 STI

Default

fuse situations SUCK. I just had the same issue after a new switch actuating a relay for an electric fan.
All of a sudden fuses blew the second I turned the key to on. I went through probably 20 before I finally found a short.
All you can do is trace every inch and make one single change at a time and then try it. Only change one thing at a time.
Buy a pack of 20 of those dinky fuses because you'll need them all.

It sucks but there's no doubt you have a short despite you not finding any yet.
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Old 07-16-2019, 08:02 AM   #3
08SpecB_DE
Scooby Newbie
 
Member#: 470981
Join Date: Jul 2017
Chapter/Region: Tri-State
Location: Delaware
Vehicle:
2008 Legacy GT spec
DGM

Default

Electrical stuff does suck! They make fuse savers that trip a breaker as opposed to replacing a fuse every time, for what it's worth. Sounds like the relay is probably wired wrong or wiring is chafed somewhere. If you unplug the relay but leave everything wired up, does it still blow?
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Old 07-16-2019, 06:21 PM   #4
RakumiAzuri
Scooby Newbie
 
Member#: 472102
Join Date: Aug 2017
Location: NOVA
Vehicle:
2018 WRX
Gunmetal

Default

Quote:
Originally Posted by MortonCharbo View Post
I installed sharptones and they worked until I went out for a drive. I checked the fuse and sure enough, it was blown. Put another in. Tested it and it worked. As soon as I started the engine, that fuse popped.

Now as soon as the fuse makes contact with the socket, pop! First off, I don't know what caused the behavior to change slightly. Second off, I don't know what's causing the problem in the first place.

I wired the relay using a combination of instructions I found on different forums. I've checked my wiring, and the existing wiring, and couldn't find any pinches or shorts.

I read somewhere that the relay may be mislabeled. Is this true? I can't find the thread that mentioned it.
Double check your relay. The fuse blowing makes it sound like a short between the pos/neg.
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