20 amp tail light fuse melting - Team Camaro Tech
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post #1 of 26 (permalink) Old Oct 2nd, 09, 03:53 PM Thread Starter
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20 amp tail light fuse melting

It looks like my 20 amp fuse for my tail lights is burnt and melting some solder. I would like to know what would be the cause of this?
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post #2 of 26 (permalink) Old Oct 2nd, 09, 04:24 PM
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Re: 20 amp tail light fuse melting

Your dash lights don't work, also, you have a few problems, you have shorts or high restiance (sp). eaelier post you can't read the # for the fuse, if there is rust on the
fuse connectors can/will cause heat and a lot of other problems.
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post #3 of 26 (permalink) Old Oct 2nd, 09, 06:21 PM Thread Starter
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Re: 20 amp tail light fuse melting

Guess I need to sand them down more.
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post #4 of 26 (permalink) Old Feb 17th, 12, 03:19 PM Thread Starter
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Re: 20 amp tail light fuse melting

Whats the best way to remove the rust for the fuse terminals?
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post #5 of 26 (permalink) Old Feb 17th, 12, 04:37 PM
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Re: 20 amp tail light fuse melting

A short is extremely low. or no resistance, which is the opposite of high resistance. Fuses blow because of too much current, which comes from too low resistance.

Web search Ohm's law. As resistance increases, current decreases.

Rusty, or dirty contacts will make for more resistance, not less, and are not causing your fuse problem. That's not to say this isn't a problem, just not the stated problem.

There may be a connector on the firewall where the tail light harness goes through. If there is, disconnect it and see if the fuse still blows. If not, the problem is in the rear harness. If it does, the problem is under the dash.
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post #6 of 26 (permalink) Old Feb 18th, 12, 03:00 PM Thread Starter
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Re: 20 amp tail light fuse melting

I disconnected the tail light harness in the trunk and from what I can see the fuse is not melting. Is this a good indication that its time for a new tail light harness?
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post #7 of 26 (permalink) Old Feb 19th, 12, 07:20 AM Thread Starter
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Re: 20 amp tail light fuse melting

There may be a connector on the firewall where the tail light harness goes through. If there is, disconnect it and see if the fuse still blows. If not, the problem is in the rear harness. If it does, the problem is under the dash.[/QUOTE]


I disconnected the tail light harness in the trunk and from what I can see the fuse is not melting. Is this a good indication that its time for a new tail light harness?
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post #8 of 26 (permalink) Old Feb 19th, 12, 07:36 AM
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Re: 20 amp tail light fuse melting

Not. if the harness is in good shape.
Since you've located the problem to the rear, puill one bulb and check fuse.
Fuse good, remove the one bulb and replace the other bulb.
Fuse blows, bad circuit or bulb - try the other bulb in the same socket.
Fuse blows, bad harness or single wire from the connector to the rear panel.
I would suspect a worn insulation spot from one of the sill cover screws.

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post #9 of 26 (permalink) Old Feb 19th, 12, 12:57 PM Thread Starter
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Re: 20 amp tail light fuse melting

Harness is not in good shape. The reverse lights don't work without a separate ground wire attached and the right running light needs to have the wire moved around it the socket to get it working.
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post #10 of 26 (permalink) Old Feb 19th, 12, 01:04 PM
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Re: 20 amp tail light fuse melting

Then I would buy a new harness.

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post #11 of 26 (permalink) Old Feb 19th, 12, 02:16 PM Thread Starter
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Re: 20 amp tail light fuse melting

thats what i'm thinking...from what I have read the American auto wire is the brand to buy
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post #12 of 26 (permalink) Old Feb 20th, 12, 11:39 AM
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Re: 20 amp tail light fuse melting

Quote:
Originally Posted by bigsteve View Post
thats what i'm thinking...from what I have read the American auto wire is the brand to buy
Yes it is.

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post #13 of 26 (permalink) Old Feb 20th, 12, 02:51 PM
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Re: 20 amp tail light fuse melting

Hopefully, in your troubleshooting efforts, you exchanged a good set of bulbs, ie, the front ones, with the rear bulbs to eliminate a bulb problem and localized it to the wire harness.

Hate to see you spend the money for a new harness and still have the same problem.

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post #14 of 26 (permalink) Old Feb 20th, 12, 02:55 PM Thread Starter
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Re: 20 amp tail light fuse melting

I've swaped all the bulb in the rear and the front directionals with new bulbs. I pulled the 2 reverse bulbs that have a bad ground and it looks like the new fuse ismelting again.

Last edited by bigsteve; Feb 20th, 12 at 04:55 PM.
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post #15 of 26 (permalink) Old Feb 22nd, 12, 12:48 PM
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Re: 20 amp tail light fuse melting

The melted fuse is a problem at the fuse itself. Probably corrosion on the fuse terminals or perhaps the wiring or rivets on the back side of the fuse block is at fault. The corrosion creates resistance that limits the current to less than 10A (no blown fuse) but generates lots of head (melted fuse).

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