rear light wiring, trying to sort out. find short to ground? |
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rear light wiring, trying to sort out. find short to ground? |
jfort |
Oct 7 2019, 09:28 AM
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#1
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Senior Member Group: Members Posts: 1,133 Joined: 5-May 03 From: Findlay, OH Member No.: 652 Region Association: Upper MidWest |
'70 factory six
has anyone made a drawing of the rear light wiring? I have the Zapf schematic but it's hard to read. And the two sides are not symmetric/the same. I may have a short to ground, perhaps it the plastic box bulb holder. I am hoping someone has a diagram of which wire goes to each terminal which connects to each bulb. in the past, car was hit in right rear. the holder is newer. they may have made a mistake. it all worked until a week ago. now it blows fuses and i have no brake or turn signal lights in rear. thanks in advance |
dr914@autoatlanta.com |
Oct 7 2019, 09:55 AM
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#2
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914 Guru Group: Members Posts: 7,772 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
It is on page 83 of the "tech tips 700" book
'70 factory six has anyone made a drawing of the rear light wiring? I have the Zapf schematic but it's hard to read. And the two sides are not symmetric/the same. I may have a short to ground, perhaps it the plastic box bulb holder. I am hoping someone has a diagram of which wire goes to each terminal which connects to each bulb. in the past, car was hit in right rear. the holder is newer. they may have made a mistake. it all worked until a week ago. now it blows fuses and i have no brake or turn signal lights in rear. thanks in advance |
defianty |
Oct 7 2019, 09:56 AM
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#3
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Senior Member Group: Members Posts: 659 Joined: 9-August 06 From: Essex, UK Member No.: 6,621 Region Association: None |
I took these when I dismantled my 73. Hopefully they're of some use.
(IMG:http://www.914world.com/bbs2/uploads_offsite/i.postimg.cc-6621-1570463784.1.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/i.postimg.cc-6621-1570463786.2.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/i.postimg.cc-6621-1570463786.3.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/i.postimg.cc-6621-1570463787.4.jpg) |
defianty |
Oct 7 2019, 09:58 AM
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#4
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Senior Member Group: Members Posts: 659 Joined: 9-August 06 From: Essex, UK Member No.: 6,621 Region Association: None |
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rhodyguy |
Oct 7 2019, 10:20 AM
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#5
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,042 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
Are strands exposed on the red and white wires on the center connection?
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ConeDodger |
Oct 7 2019, 10:29 AM
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#6
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Apex killer! Group: Members Posts: 23,543 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California |
Bowlsby’s site.
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drem914 |
Oct 7 2019, 10:31 AM
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#7
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Senior Member Group: Members Posts: 1,024 Joined: 16-May 08 From: Trabuco Canyon, CA Member No.: 9,062 Region Association: Southern California |
Is this what you meant?
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jcd914 |
Oct 7 2019, 12:40 PM
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#8
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Advanced Member Group: Members Posts: 2,081 Joined: 7-February 08 From: Sacramento, CA Member No.: 8,684 Region Association: Northern California |
Is this what you meant? (IMG:style_emoticons/default/agree.gif) I have a copy of this on my tablet and it has been very helpful as I have redone the wiring to the rear light twice now. Jim |
jfort |
Oct 7 2019, 02:43 PM
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#9
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Senior Member Group: Members Posts: 1,133 Joined: 5-May 03 From: Findlay, OH Member No.: 652 Region Association: Upper MidWest |
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jfort |
Oct 7 2019, 02:59 PM
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#10
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Senior Member Group: Members Posts: 1,133 Joined: 5-May 03 From: Findlay, OH Member No.: 652 Region Association: Upper MidWest |
Is this what you meant? Drem914. That’s it! Perfect. Thanks. My work confirms what you have. I have a shirt to ground in the left brake light bulb housing Now I want to add to this the terminal numbers on the bulb housing, for example, RF, 54, 58. 54 is in the middle and connects to the brake light bulb lower filament |
jfort |
Oct 7 2019, 03:30 PM
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#11
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Senior Member Group: Members Posts: 1,133 Joined: 5-May 03 From: Findlay, OH Member No.: 652 Region Association: Upper MidWest |
Is this what you meant? Drem914. That’s it! Perfect. Thanks. My work confirms what you have. I have a shirt to ground in the left brake light bulb housing RF 54 58 31 R 58 is running light to dual filament bulb 54 is brake light to dual filament bulb 31 is ground R is turn signal RF must be the back up light but doesn’t work on mine |
Rob-O |
Oct 9 2019, 11:42 PM
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#12
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Senior Member Group: Members Posts: 1,251 Joined: 5-December 03 From: Mansfield, TX Member No.: 1,419 Region Association: Southwest Region |
I had a similar issue. Cleaned the wiring, cleaned and inspected the bulb holders. When I pulled the reflector I found that one of the wires leading from the bulb holder to the terminals on the INSIDE of the housing was broken and shorting out.
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drifter914 |
Oct 10 2019, 09:14 AM
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#13
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drifter914 Group: Members Posts: 50 Joined: 12-May 13 From: pearce, arizona 85625 Member No.: 15,863 Region Association: Southwest Region |
Sorry George... there is nothing on page 83 of your book " 914 Tech Tips 700" about tail light wiring.
Want to make another guess ? |
dr914@autoatlanta.com |
Oct 10 2019, 11:22 AM
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#14
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914 Guru Group: Members Posts: 7,772 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
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drifter914 |
Oct 10 2019, 01:16 PM
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#15
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drifter914 Group: Members Posts: 50 Joined: 12-May 13 From: pearce, arizona 85625 Member No.: 15,863 Region Association: Southwest Region |
Sorry too... next time you might want to mention which edition you are referencing.
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jfort |
Oct 14 2019, 03:43 PM
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#16
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Senior Member Group: Members Posts: 1,133 Joined: 5-May 03 From: Findlay, OH Member No.: 652 Region Association: Upper MidWest |
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jfort |
Oct 16 2019, 04:52 PM
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#17
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Senior Member Group: Members Posts: 1,133 Joined: 5-May 03 From: Findlay, OH Member No.: 652 Region Association: Upper MidWest |
Problem NOT SOLVED after installing 2 newer light assemblies. We checked after installing but they quit on the way home. I suspect a short in the brake circuit. Brake light switch? I don’t even know where it is. Help! Advice?
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Mikey914 |
Oct 17 2019, 12:14 AM
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#18
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The rubber man Group: Members Posts: 12,625 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None |
Brake light switch is on the back of the brake pedal on the pedal cluster. switch opens when the brake is depressed turning on the light. Hope that helps
Attached thumbnail(s) |
theer |
Oct 17 2019, 11:29 AM
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#19
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Senior Member Group: Members Posts: 675 Joined: 31-July 15 From: Dover, MA Member No.: 19,014 Region Association: North East States |
(IMG:style_emoticons/default/agree.gif) That switch can get misaligned when you bleed the brakes. The switch must be engaged to turn the brake light off. A washer on the pedal holds the switch arm in the OFF position. Pushing the brake pedal releases the spring loaded arm which closes the circuit and turns the brake lights on. If your brake lights are always on, the pedal isn't catching the little arm on the switch (which is what happened to me). |
jfort |
Nov 4 2019, 10:10 AM
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#20
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Senior Member Group: Members Posts: 1,133 Joined: 5-May 03 From: Findlay, OH Member No.: 652 Region Association: Upper MidWest |
I solved my problem and learned a lot. On the chance it will help someone in the future, I'll relate. Lord knows others' doing the same has helped me immeasurably.
Right turn signal was blowing fuse 9. 4-ways blew 11. This even after I replaced both rear light assemblies. The blk/grn wire to the RR turn signal showed ground. User "Spoke's" diagram helped me realize that the directional lights in the tach are in the same circuit and that's where I found some bad wiring, probably my fault, and a bad ground. Works fine now. Things I learned: Per Spoke, I confirmed the short was not in the assembly. But I learned that the +12V has a path to ground through the bulb nevertheless and that a simple continuity detector was not good enough. There is 0.8 Ohms resistance to ground through the bulb, but not the 0.0 that would be a true short. So that's when I focused on the tach and found my problem. Also, I used a newly purchased PowerProbe III. I could do what it did with a DVOM and a 12V source, but the PowerProbe was much easier and faster. But where it said "ground" I confirmed with the DVOM and measure the resistance. Not often that I figure out a problem, fix it, know how I fixed it and that it is truly fixed. Let me bask in my glory for a day. Something else will come up. see: http://www.914world.com/bbs2/index.php?showtopic=341464 |
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