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Old 12-29-2007, 03:14 PM   #1
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Exclamation No power from 12v Ignition Wire - Help?

I have a 96 GMC Sierra W/T. Recently my Sony H/U died (could insert and eject CD's - just no sound, or power on the faceplate). Bought a new Alpine H/U, installed it with the same deal - no power at all, in fact I cant even insert a CD. I used a test light and I'm getting power at the H/U fuse, the yellow 12v battery wire but nothing from the red 12 v ignition wire. I found a blown fuse for the Horn (horn worked before - but I changed the fuse anyway). All other fuses seem to be working.

Not sure what to do? I have an amp and a 12" sub, sitting there, not even hooked up yet - so they are definitely not the cause.

Any suggestions? The ground is definitely working from the Head Unit.... I even ran a ground line from the battery to the head unit - still nothing.
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Old 12-29-2007, 03:23 PM   #2
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Check under your hood, I know wierd place to look, but I have a 00 blazer and I had a similar problem, there was a Yellow clip looking thing , it had 2 fuses in it, one was blown. replaced it and everything came alive again I don't know how similar these vehicles are but I know gm likes to keep practical!!
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Old 12-29-2007, 03:25 PM   #3
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You got that right! I'll check again.

If not, I'll try to tap into a 12v ignition wire (maybe heater?) and splice a new line straight through...

I really don't want to take it into the shop.


...This is actually my sister's vehicle, but guess who gets the headaches when things go wrong.
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Old 12-29-2007, 03:43 PM   #4
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Quote:
Originally Posted by Killer_klown187 View Post
there was a Yellow clip looking thing , it had 2 fuses in it, one was blown.

Where exactly was this? I checked everywhere. Can't seem to find it. I'll try googling a picture of it.
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Old 12-29-2007, 05:31 PM   #5
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Fixed!


Turns out the Radio fuse was blown. Go figure. My buddy spent 5 hours, I spent another 3 hours - and we couldn't figure it out. What got me was the test light. I hit it with the probe, and it lit, but when I hit the other (diode?) there was nothing. Changed it and now the radio works!

It's only a 10A, so if it starts blowing frequently, I'll stick a 30a in...
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Old 12-29-2007, 05:56 PM   #6
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For each fuse in your fuse panel there is an input side and an output side, you were obviously sticking your testlight into the input side which will continue to show voltage there, but if you put the testlight on the output side you would have got nothing since the fuse was blown and couldn't pass voltage to the output side. It's always best to pull the fuses out to check them if you suspect one is blown.

Also, the fuses are rated at certain amperages for a reason...it is not a good idea to put larger than rated fuses in place of a smaller one....you are asking for trouble that way...at the least, possibly some melted wires, at worst an electrical fire.
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Old 12-29-2007, 06:37 PM   #7
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Ah, thanks for the info Steve. Much appreciated! I'll just hope that it doesn't start blowing fuses I guess. If it does, well - I'll figure that out later if I need to.
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Old 12-29-2007, 06:59 PM   #8
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Well if you start blowing fuses that means that you are pulling too much current through that fuse. If that happens, try tapping into a 20 amp location.
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Old 12-29-2007, 06:59 PM
 
 
 
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