Author Topic: Turn signal fix  (Read 974 times)

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Offline zxshep

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Turn signal fix
« on: December 28, 2020, 08:23:17 PM »
I put the finishing touches on the rear end of the 400F tonight and got some of the smaller things mounted.  After I got the turn signals mounted I hooked up the battery and tested the switches and lights.  Everything lit and "switched" except for the right rear turn signal.  I checked the connections for it, which were all good.  I removed the amber cover and checked the bulb, which was also good, and found that if I pushed the bulb in it would be begin to flash.  I removed the turn signal from the bike and disassembled it.  I found the black center wire has become disconnected from whatever/wherever it was soldered to.

Anyone encountered this and can tell me where I need to solder it back to?  Wire and end are intact.  The glob of solder is even still there.  Just need to know where its home is so I can get it back together and move on to the next phase.  These are the stock, and as far as I can tell, original rear turn signals.

Thanks for your help and time.
2005 CR125R
1975 CB400F

Offline kerryb

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Re: Turn signal fix
« Reply #1 on: December 28, 2020, 10:06:10 PM »
I haven't worked on a 400, but all the honda signals I've worked on had one or two wires soldered to the contacts in the socket which are a small brass button. This contact plate is held against the bulb by a spring behind it.  The ground wire would be soldered to the tab that holds the socket into the reflector base.  (Two hots for front signals, only one for rear)
You might have to remove the socket from the reflector to gain access to the back of the contact plate where the wire is soldered on.  Try to resist pulling the wires out of the mounting stem, there is a rubber plug in there that is difficult to get the wires to go  back through for reassembly.
intrigued by the wail...seduced by the scream.

Offline newday777

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Re: Turn signal fix
« Reply #2 on: December 29, 2020, 04:50:06 AM »
You just need a replacement pigtail from an auto parts store. They come with the brass contact already crimped/soldered on.
Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline zxshep

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Re: Turn signal fix
« Reply #3 on: December 29, 2020, 07:50:22 PM »
Fixed it!  I took the bulb out of the left turn signal and studied it and compared to the right.  The center conductor "button" on the right signal had disappeared and just a little nub was left that had pulled through the plastic insulator ring.  I took apart the signal and pondered how to remake the nub.  I found a screw that had the right diameter head, so I drilled out the center which also released the shank.

The hole was just big enough to get the nub on the wire end through.  I verified everything was in place in the rubber body and then filled in the hole around the nub with solder.  After some fine-tuning it was all set.  I reassembled the light, mounted it, and it tested successfully.

On to the next thing!
2005 CR125R
1975 CB400F

Offline BenelliSEI

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Re: Turn signal fix
« Reply #4 on: December 30, 2020, 04:57:09 PM »
Nothing better than a clever fix!