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Electrical Issues with a 78 CB 400 T
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Electrical Issues with a 78 CB 400 T - August 15, 2011, 11:19 AM

I am cafe-ing the aforementioned bike and have run into a bit of a problem. And since many of you seem to know your way around older bikes, figured I throw this issue out.

I am re-connecting the wiring harness to the instrument cluster/headlight/horn. I have removed the turn signals, so the headlight bucket is nice and clean looking. My issue is I have gotten the instrument cluster lights all working (except the turn signal indicator, but that's understandable since there are no signals) but the headlight doesn't work. When I plug the headlight in, the high beam indicator won't turn off regardless of whether the high beam toggle is on or not. When I unplug the headlight, the high beam indicator works properly.

Any thoughts?

Thanks.
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August 15, 2011, 10:49 PM

Possibly switched the low beam/high beam wires?


'11 Speedy
'72 CB450
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August 15, 2011, 11:58 PM

Google is your friend. I too had some electrical drama from my 74 CB550, but a quick search on Google and I found a wiring diagram. Just trace your wires and see where you got it wrong.

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August 16, 2011, 08:26 AM

Doc, I didn't remove or disconnect any of the hard connections, just plugged everything back in.

Brian, thanks, but I have the diagram from the manual. I have run the lines all the way back to the fuses..

Back to the experimentation.
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August 16, 2011, 09:50 AM

Did you try checking to make sure the headlight is getting power to it? It could be a bad headlight, my low beam just went out last week. Also, check all your grounds. These old bike depend on good grounds otherwise nothing will work.

Quote:
Originally Posted by liquidAir View Post
Doc, I didn't remove or disconnect any of the hard connections, just plugged everything back in.

Brian, thanks, but I have the diagram from the manual. I have run the lines all the way back to the fuses..

Back to the experimentation.
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