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Old 04-09-2006, 01:21 PM
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Fuse keeps blowing, need some guidance

Some background: I have a 1991 300E with premium sound package. I've been installing a pioneer deck and some components in my car, but one day while I was working on it I shorted out a wire and the #1 and 9 fuses blew.

The Problem: I got a pack of new fuses of ebay to replace the broken ones. I replaced fuse #1 and #9 and turned the car to accessory. Everything checks out fine until I start the car, the first fuse lasted a little time and the deck actually worked again and the rear headrest dropped when I hit the button. I turned it off to get a cd and put the key back in to start it and the fuse blew. Three fuses went by, everytime I would start it up it would blow.

Heres what fuse #1 does according to my fuse box: cigar lighter, switch heatable rear window, glove compartment light, rear wipe/wash system, folding head restraints/ rear compartment, radio (ortho, back rest)

I'm seriously confused, I have no clue what keeps blowing this fuse. If anybody could give me any direction so I can fix this ASAP I would appreciate it. Thanks.

-Shawn

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  #2  
Old 04-09-2006, 02:13 PM
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Maybe your over loading the fuses. Why not install seperate inline fuse for your radio and components.
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  #3  
Old 04-09-2006, 02:28 PM
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I agree! From what you're telling us, you're overloading the rating capacity of the fuses. Just install seperate "in-line" fuses, based on the current ratings of the "new" components you've added.
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  #4  
Old 04-09-2006, 03:44 PM
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Where would I splice the inline fuse into. All I have hooked up right now is a pioneer headunit running to the two front dash speakers so I'm pretty sure I'm not overloading it. And I put a new fuse in to try it out again, turned it to accessory and it blew before I even got a chance to start the car. Thanks for the fast responses.
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  #5  
Old 04-09-2006, 04:21 PM
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You have a short circuit. There are a number of ways to find it. Your best chance is to retrace your steps and remove all the connections you have made, remove any new screws you have installed and verify whether that worked. If that worked then either figure where you shorted the system or start over.

The systematic way of finding the short would be to divide the system. The logical place is at the fuse but the wires there are usually made together. One could cut the circuits out one at a time till the short was removed then figure out what isn't working (of the things on that circuit) and disassemble that system looking for the short.

A more scientific way to find the short: http://www.powerprobe.com/findingshort.mov

A simple device can be built with a two prong VW flasher and a bulb. Hook one wire to each leg of the fuse creating a flashing light. Use a compass along the wire to follow the current.

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