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Old 01-20-2012, 11:42 PM
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No rear running lights

I have a 1973 Javelin, 232 6 cylinder manual 3 speed transmission. I have head lights, front and rear turn signals, and rear brake lights, but I have no rear running lights. I have checked the fuses and bulbs. Anyone tell me what the trouble is? Thanks

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Old 01-21-2012, 05:42 AM
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Probably a broken wire somewhere........the car is 40 years old and the wiring probably is deteriorating
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Old 01-21-2012, 05:57 AM
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Well first thing you should test the socket, if there is power then check the grounds.
If it doesn't have power and it has a good ground then your power wire is bad.

Ground connections would be were I would start.
Good luck
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Old 01-21-2012, 01:55 PM
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If after checking the grounds as mentioned above the trouble still exists, check the following items.
How did you check the bulbs? Make sure you use a known working bulb. A visual check is not enough. Also the fuse must be checked with a voltage tester.
The rear running lights normally are the same as the parking lights.
If the front parking lights are working that rules out the headlight switch as the problem.
If the front parking lights are not working check out the headlight switch and wiring to the lights.

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Old 01-23-2012, 06:25 PM
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Parking light problem figured out

OK, I checked everything with my volt ohm meter and found one bad fuse, two bad grounds, and a blown bulb up front. That is the second time in a week that same 14 amp fuse has blown. After repairing all of this I still did not have the running lights. I checked the sockets both front and rear and there was no current getting to the socket. The head light switch is a two hour job to replace because you have to remove most of the dash to get to it, and probably will not find a replacement switch, so I will cut the wires off that switch and wire in a new toggle switch to see if that solves the problem. Its either got to be that switch or related wiring.

Thanks so much for all the wonderful information on tracking down this electrical problem.
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Old 01-23-2012, 06:39 PM
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Before you do that, check your wiring going through the interior, probably under the carpet. Betcha there's a broken wire or two there
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Old 01-23-2012, 06:54 PM
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Remove the dvrs side door sill plate, pull back the carpet and you should find a metal shield protecting the wires running to the trunk area, my guess is there is a broken or frayed wire in that area. use a 12 lo=ight probe and see if you have pwr to the wires in that area etc..... move towards the trunk area until you find your short.
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Old 01-24-2012, 01:53 PM
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Still Having problems

Still having problems. I pulled up the carpet and took out the back seat and all the wiring looks as good as the day it was installed. Could not find a problem anywhere with that.

I was able to pull the headlight switch out and check it with a meter but not sure if it is good or not. This is a toggle switch. When you push it half way up the running lights are supposed to come on and when you push it up all the way the head lights and the running lights are supposed to come on. Currently I only have head lights with no running lights.

Their are 4 terminals on the back of the switch.

top terminal - B 1

second from top - R

third from top - B 2

bottom - H

With the power on and the switch connected this is the reading I get when checked at the switch terminals.

Switch pushed half way I get a reading between B1 and H only.

Switch pushed all the way forward I get a reading between R and H and
between H and B2

Is that switch good or bad?

Any information appreciated. Thanks
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Old 01-24-2012, 03:38 PM
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The wire colors on the switch should tell you what each wire is used for.
For example, find the wire going to the headlights and then find that color on the switch.
All voltage tests should be done with reference to ground not across the terminals.
My guess is the H terminal is the battery feed, hot at all times. Most likely a red wire that is larger that the other wires on the switch.
The B1, B2, R terminals can be tested for voltage at each position of the switch and the color of the wire.

vicrod
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Old 01-24-2012, 04:14 PM
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Diagram The wire you are looking for is dark blue. Feeds the front rear and license plate lights as well as the side markers. The diagram I have shows a fuse at the switch for the running lights.
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Old 01-24-2012, 07:37 PM
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Finally found the problem!

Call the neighbors and wake the kids, I found the problem and fixed it. I would have never fixed it if it wasn't for you guys helping me on here so thank you very much for that. I was in there checking all the stuff you told me to do when by accident I bumped the fuse panel, and for a brief second the parking lights came on. I got a good light and shined it up in that area and discovered that one of the screws that holds the fuse panel in place had backed out from 40 years of vibration and was touching that 14 amp fuse terminal on the side thus grounding out the whole circuit. I just tighten up that screw so it would hold the fuse panel tightly in place and stop touching the fuse terminal, and now the running lights work perfect. Never would have guessed this one. Thanks for all the help.
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Old 01-24-2012, 07:50 PM
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Glad you found the problem!!!!!!!!

Thank's for posting back after finding the problem, i would not have thought about the box having a screw loose.




Cole
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Old 01-24-2012, 08:08 PM
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Good to hear you got it fixed...... and on the cheap!
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