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Old 09-12-2010, 08:43 PM   #1
Brawn
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Member#: 251833
Join Date: Jul 2010
Chapter/Region: TXIC
Location: McKinney, TX
Vehicle:
2010 Forester
Black

Question Help With a Switch Light?

I'm not big on electronics, etc. so I really need help with what could be quite possibly a simple question:

I want to run an extra accessory on my vehicle and I'm using a cheap $4 lighted switch from Auto-Zone. I believe its labeled as a SPST rocker switch with 3 prongs underneath. Its rated as a 12 V, max 20 Amp and for acc. 240 watts.

I have one prong connected directly to the (+) positive of my battery. The middle prong is connected directly to the (+) wire of my accessory. And the third prong is connected directly to the (-) negative of my battery.

My accessory works fine when switched on and off. The switch light even works well for a day... but then it burns out by the next day. What am I doing wrong? How can I keep my switch light from burning out, did I wire it wrong? At least when the switch light burns out, my accessory still works, but I want the switch light to work too!

I have some theories, but I want to hear what others say on here first. Thanks!
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Old 09-12-2010, 08:58 PM   #2
cabikejumper
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Location: Stephenville,tx
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Sounds like your load is too high.
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Old 09-12-2010, 09:10 PM   #3
02boxer
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2002 wrx....its tsxy
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what accessory are you wanting to run?

Sounds like you should wire in a relay, and let that take the brunt of the electrical load

chris
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Old 09-12-2010, 11:01 PM   #4
Brawn
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Chapter/Region: TXIC
Location: McKinney, TX
Vehicle:
2010 Forester
Black

Question

oops, ok i forgot to mention I need layman's terms here... load? relay? you guys lost me.

It does sound close to my theory though... I'm thinking every now and then the battery sends a surge of electrical charge more than 12volts and its frying my little switch bulb. Is there some device that I can wire in-between the battery and my switch that can prevent surges from reaching my switch? Sort of like a surge protector? Am I on the right track?
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Old 09-15-2010, 03:53 PM   #5
Brawn
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Member#: 251833
Join Date: Jul 2010
Chapter/Region: TXIC
Location: McKinney, TX
Vehicle:
2010 Forester
Black

Lightbulb Update

Ok, I got some pretty good advice from Yahoo! Answers, so I decided to place a fuse on my power supply running from my positive terminal to my switch...

I also decided to ground the negative wire to a the frame as opposed to the negative terminal on the battery.

So far so good... but my only concern is that the blade fuse I'm using is rated at 20 Amps and my switch is rated at 20 Amps... so should I be using a 15 Amp fuse instead?
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