'91 Civic New Dash Blows Fuses - Mustang Evolution

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Old 04-22-2009, 12:34 AM   #1
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'91 Civic New Dash Blows Fuses

I need a little help here guys for my good buddy.

He has a 1991 Civic Hatch. The car has come a long way and is looking fantastic. He has replaced the entire interior from a cheesy blue half-assed put together interior to nice black and gray interior.

A new dash was put into it this past Sunday his friend did for him and since then he has been blowing the same fuse over and over again.

Tonight we did some trouble shooting and did not solve it, however we have an idea of what it could be, we were just not able to go ahead and try it as it had gotten late and involved removing the dash. Anyway here is what is going on:

When he turns on his parking lights he blows the fuse for it. The fuse is for parking lights, instrument lights, and his license plate lights.

Now, I know it's not his taillights since I unplugged them when I did my testing. My testing involved unplugging the headlight switch assembly and jumped each individual pin until I found which one blew the fuse. When ever the parking light pin was closed the fuse blew. And so went the instrument lights. Head lights and High Beams were good (of course they are on their own fuse).

Obviously we know there is a short somewhere we are just not sure. Again we have an idea but I want to hear what some of you think before I post my idea out there and see if I get a similar response.

Thanks ya'll.
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Old 04-22-2009, 04:17 AM   #2
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Re: '91 Civic New Dash Blows Fuses

Then you should ask him what he did... Its a false ground recheck all the wires... But the things you were doing are ok
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Old 04-22-2009, 09:44 AM   #3
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Re: '91 Civic New Dash Blows Fuses

maybe you should tell him to trade it in for a Ford, j/k.
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Old 04-22-2009, 10:21 AM   #4
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Re: '91 Civic New Dash Blows Fuses

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maybe you should tell him to trade it in for a Ford, j/k.
hahahahaha...he did
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Old 04-22-2009, 11:34 AM   #5
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Re: '91 Civic New Dash Blows Fuses

Probably a faulty ground.
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Old 04-23-2009, 01:56 AM   #6
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Re: '91 Civic New Dash Blows Fuses

I thanked you Mustangfan because I do tell him all the time, he even just admitted it Then again he asks me when I'm getting a Honda

We knew it was a faulty ground but just didn't know where. So here's the update.

Got it to stop blowing fuses. Pretty mush unplugged everything on the fuse. Pulled out the front bulbs, unplugged the rear tail light connectors, instrument cluster and HVAC cluster lights. Pulled the dash back out, no biggie it was just six bolts (thank you Honda's under engineering ). Looked at the rest of the harness but it all looked fine.

We then plugged each bulb in one by one with the parking light switch on, waiting to see when the fuse blows. We get all the parking lights in on the front with out the fuse going. We know from the previous night it's not the tail lights but still have them unplugged. Only thing that's left is the instrument cluster and HVAC cluster lights WHICH is where we thought it was all grounding out.

We then plugged in the HVAC plug, since it was a simple +12/GND harness and POP! There goes the fuse. We now know where it's coming from, which we didn't really expect since the wires looked fine and weren't, or shouldn't have been tampered with.

I ghetto tested the theory by jumping the harness with a piece of wire and fuse goes again, so we had isolated where our short was.

I start undoing all the tape around the wires to trace them and we lose it behind the carpet/firewall. I do some testing with the instrument cluster and such and the cluster still works. Again I trace the wires going back and into the fuse box and it all disappears into the upper drivers kick panel.

We left the HVAC lights unplugged as it wasn't all important and everything now works.

Now the new theory is the short is grounding out somewhere along or on the dimmer switch wires, since the dimmer switch no longer works, the short is now just completely bypassing the dimmer.
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Old 04-23-2009, 06:53 AM   #7
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Re: '91 Civic New Dash Blows Fuses

usually a bad dimmer switch will blow the fuse repeatedly. i had the same issue not too long ago.
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Old 04-23-2009, 01:50 PM   #8
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Re: '91 Civic New Dash Blows Fuses

Dimmer switch is plugged back in
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