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Old 04-20-2008, 02:06 AM
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Rear fuse keeps blowing

When I got my 68 Firebird Coupe last week it had a blown fure on the Fuse labeled "rear" so I drove it home as quick as possible, with no instrument lights, brake, running or turnsignal lights.

Once I got it home I found that the guy before me was not very electrical savvy. He had the casing of the rear side indicator tied to the yellow (which is the left signal wire) . Then he had the license plate lamp line (brown) pulled through the penetration in the trunk without a grommet and scraped the jacket causing that to ground on the body also. (again... )

I pulled all the wiring out of the smurf tubing, cut them at the first splice junctions and metered the color lines to see which ones had grounded out. These were the only two that I found and repaired all of them. I soldered all of my splices and taped them, also replaced any lines that had multipule splice points in them, with solid lines.

The car ran for the whole day today without the fuse blowing, but tonight when I was driving home, the running lights, turn signal indicators and instrument lights went out, but the brake indicators continued to work.

My question is, are all of these tied to the "rear" fuse on the block? If so, then why are only these ones out again?

I don't know if the fuse is blown again, I will check in the morning. Just a little extra info, the turnsignal indicator on the front left is missing, and I don't have a light fuse in in the courtesy lamp. Could any of this be playing a factor?

This is a link to the wiring diagram for the vehicle...
http://www.dingdongtx.org/1968/68wir/68wir5.html

Thanks Guys

Dave

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Old 04-20-2008, 02:08 AM
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almost forgot

I also replaced ALL of the tail light and side marker bulbs and sockets (they really were in bad shape) when I fixed all of the wiring.
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Old 04-20-2008, 04:14 PM
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re;rear fuse keeps blowing

Quote:
Originally Posted by 63CustomCab
When I got my 68 Firebird Coupe last week it had a blown fure on the Fuse labeled "rear" so I drove it home as quick as possible, with no instrument lights, brake, running or turnsignal lights.

Once I got it home I found that the guy before me was not very electrical savvy. He had the casing of the rear side indicator tied to the yellow (which is the left signal wire) . Then he had the license plate lamp line (brown) pulled through the penetration in the trunk without a grommet and scraped the jacket causing that to ground on the body also. (again... )

I pulled all the wiring out of the smurf tubing, cut them at the first splice junctions and metered the color lines to see which ones had grounded out. These were the only two that I found and repaired all of them. I soldered all of my splices and taped them, also replaced any lines that had multipule splice points in them, with solid lines.

The car ran for the whole day today without the fuse blowing, but tonight when I was driving home, the running lights, turn signal indicators and instrument lights went out, but the brake indicators continued to work.

My question is, are all of these tied to the "rear" fuse on the block? If so, then why are only these ones out again?

I don't know if the fuse is blown again, I will check in the morning. Just a little extra info, the turnsignal indicator on the front left is missing, and I don't have a light fuse in in the courtesy lamp. Could any of this be playing a factor?

This is a link to the wiring diagram for the vehicle...
http://www.dingdongtx.org/1968/68wir/68wir5.html

Thanks Guys

Dave
Just hunch,try checking the ground circiut.it may have to do with the ground on the dome,inst. panel lights. After you eliminate the easiest options,try the obvious. Tom I forgot to mention, this week I had a situation where, when I hit reverse,the ground would power up and pop the fuse,rewiring the ground cured the problem.

Last edited by sprecher48; 04-20-2008 at 04:23 PM. Reason: addition to answer
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Old 04-20-2008, 05:39 PM
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I would take a look at the harness in the door channels or under the back seat. these are common failure areas. You may have had more than 1 issue. A fuse blowing short can be a real pain to find. Be patient and you will find it
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Old 04-20-2008, 07:05 PM
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Thanks Guys, I'll look into both of those possibilities. And yes indeed, this is very frustrating.

Just curious though, say I wanted to rewire the entire car because I've found so many problems in the wiring system already. Do the major harness manufacturers that make them specific to the vehicle (ie. EZ, Painless, etc), include all of the sockets and connectors with those kits??

Last edited by 302 Z28; 04-21-2008 at 06:12 AM. Reason: Violation of guidelines. Please see: general board guidelines.
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Old 04-20-2008, 08:23 PM
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re;rear fuse

I would think they were included,but I'd hang on to the old harness just in case. A pick set works great to remove the plugs without hurting the plug,just be careful and don't rush it. Tom I've always had real good luck with Haynes manuals, they seem to be pretty comprehensive.

Last edited by sprecher48; 04-20-2008 at 08:26 PM. Reason: additional info
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Old 04-21-2008, 06:04 AM
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My sons and I rewired most of our Jeep with no kit, just the factory service manual diagrams and a lot of wire. Takes awhile but there is a lot of satisfaction, plus the learning value for the boys when their weak wire splice let go and stranded them and I showed up to fix it -- in front of the Dairy Queen, with their friends watching.....
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Old 04-21-2008, 06:13 AM
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Quote:
Originally Posted by 63CustomCab
Thanks Guys, I'll look into both of those possibilities. And yes indeed, this is very frustrating.

Just curious though, say I wanted to rewire the entire car because I've found so many problems in the wiring system already. Do the major harness manufacturers that make them specific to the vehicle (ie. EZ, Painless, etc), include all of the sockets and connectors with those kits??


Most come with some connectors like wper switch, ignition switch, headlamp switch, alternator connector, HEI connector, but none that I know of come with any lamp connectors.

Vince
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Old 04-22-2008, 01:34 AM
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Going to do it myself

Thanks for all of the input guys. I am going to go ahead and rewire the car myself. I'm an electrical contractor, and the supplier that I use can get me all of the wires that I need for about $80, which seems way more appealing to my than the hundreds for a new harness. I will look into the Hayes book; I've used them several times before and they are always pretty handy.
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