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Author Topic: Help with signal lights wiring  (Read 935 times)

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Offline Vhonda

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Help with signal lights wiring
« on: September 03, 2024, 05:13:12 PM »
1973 CB500

I should have left it alone !

I swapped the LED front signal back to stock signals and blew my 15A fuse twice.

I am using one of the LAMP-LED

I have my right side (throttle) signal working, but my front left (clutch) signal is not working. Currently the wire is disconnected, I tried two connections but they both blew my 15A fuse.

Now my Acewell Speedometer is not showing rpm and speed!
« Last Edit: September 03, 2024, 07:46:38 PM by Vhonda »
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73' CB500
76' CB550k
77' Yamaha 750

Offline denward17

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Re: Help with signal lights wiring
« Reply #1 on: September 03, 2024, 05:15:10 PM »
Is your green ground wire plugged in?
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Offline Vhonda

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Re: Help with signal lights wiring
« Reply #2 on: September 03, 2024, 05:19:33 PM »
these two green wires in the casing?  NO

(everything worked fine when I was using LED front lights)

where do they go?
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73' CB500
76' CB550k
77' Yamaha 750

Offline Vhonda

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Re: Help with signal lights wiring
« Reply #3 on: September 03, 2024, 05:22:03 PM »
I went from these LED with 3 wires back to stock.
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73' CB500
76' CB550k
77' Yamaha 750

Offline denward17

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Re: Help with signal lights wiring
« Reply #4 on: September 03, 2024, 05:27:59 PM »
I don't know about LEDs, but the normal turn signals on a '76 550 requires the green ground wires to be plugged to the main harness green connectors inside the headlight bucket.

The green wires you are holding in the pic goes to the turn signal grounding bolts on the inside of bucket, yes?
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Offline Vhonda

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Re: Help with signal lights wiring
« Reply #5 on: September 03, 2024, 05:35:05 PM »
Yes those two green wires are attached to the two bolts inside the housing.

ok here is what I did, found other green female to attach to

1st pic LEFT

2nd pic Right
« Last Edit: September 03, 2024, 05:37:09 PM by Vhonda »
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76' CB550k
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Offline Vhonda

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Re: Help with signal lights wiring
« Reply #6 on: September 03, 2024, 05:42:16 PM »
now where does the front left (clutch side) signal wire go? It is a single wire.

the orange connectors? this is where my 15A fuse blew. marked by white tape.

MANUAL says orange is for left side signals I even checked and unplugged and it does indeed control the left signal. When I plug in the front stock signal to this 4 way plug it kills my 15A fuse.
« Last Edit: September 03, 2024, 06:17:36 PM by Vhonda »
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73' CB500
76' CB550k
77' Yamaha 750

Offline Vhonda

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Re: Help with signal lights wiring
« Reply #7 on: September 03, 2024, 05:46:15 PM »
full photo of nest
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Offline denward17

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Re: Help with signal lights wiring
« Reply #8 on: September 03, 2024, 06:24:32 PM »
You should have an orange / white wire bundle from the main harness to connect it to.
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Offline Vhonda

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Re: Help with signal lights wiring
« Reply #9 on: September 03, 2024, 06:30:24 PM »
help me understand this green ground wire.

this bold attached to the green housing wire is to ground the bracket?

I attached it to the 3 connectors with the other green ground wires.
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73' CB500
76' CB550k
77' Yamaha 750

Offline denward17

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Re: Help with signal lights wiring
« Reply #10 on: September 03, 2024, 07:19:02 PM »
I think you have it attached correctly now.
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Offline Vhonda

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Re: Help with signal lights wiring
« Reply #11 on: September 03, 2024, 07:54:09 PM »
Not working

Connected green ground wires as shown.

Attached a single wire from the left signal assembly to the orange cluster, blew my 15A fuse again.

There are only 2 cluster: Orange (for left) and Greyish cluster (for right). The right side works, simple plug into cluster.

Calling it a day, any help would be appreciated, thanks
« Last Edit: September 03, 2024, 10:25:50 PM by Vhonda »
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73' CB500
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Offline bryanj

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Re: Help with signal lights wiring
« Reply #12 on: September 04, 2024, 01:59:59 AM »
That suggests there is a trapped or shorted wire in the turn signal
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline newday777

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Re: Help with signal lights wiring
« Reply #13 on: September 04, 2024, 08:13:05 AM »
Orange is for the turn signal.
Orange/white(stripe) is the running light which turns off while the turn signal is flashing on that side.
Solid green is ground.
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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 Vhonda

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Re: Help with signal lights wiring
« Reply #14 on: September 04, 2024, 10:39:29 AM »
PROBLEM SOLVED: Pinched left signal wire at the frame, exposed wired, from rust/old wire, wired replaced and everything is back up. Thanks everyone.
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76' CB550k
77' Yamaha 750

Offline bryanj

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Re: Help with signal lights wiring
« Reply #15 on: September 04, 2024, 11:22:49 AM »
Do i get a prize?
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline Vhonda

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Re: Help with signal lights wiring
« Reply #16 on: September 04, 2024, 02:30:18 PM »
how about a photo of the finished product

and if you have Venmo I can buy you a beer.

I had LED signals but went back to some OEM signals to preserve the vintage look.
« Last Edit: September 04, 2024, 02:32:14 PM by Vhonda »
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73' CB500
76' CB550k
77' Yamaha 750
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