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Author Topic: Cb400f troubleshoot  (Read 576 times)

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Offline ericinwisconsin

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Cb400f troubleshoot
« on: November 11, 2012, 10:04:22 PM »
Hey guys, I just bought another cb400f and am having some electrical trouble. Symptoms are as follows:
-dim headlight gets brighter with higher engine rpm
-starter works intermittently
-battery tested fine

Gut feeling is voltage regulator. Luckily I have my other bike to swap parts to troubleshoot, just thought I would poll you guys before I dug in. Cheers!
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1975 cb400f

Offline flybox1

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Re: Cb400f troubleshoot
« Reply #1 on: November 12, 2012, 07:42:46 AM »
Quote from: ericinwisconsin on November 11, 2012, 10:04:22 PM
Hey guys, I just bought another cb400f and am having some electrical trouble. Symptoms are as follows:
-dim headlight gets brighter with higher engine rpm
-starter works intermittently
-battery tested fine

Gut feeling is voltage regulator. Luckily I have my other bike to swap parts to troubleshoot, just thought I would poll you guys before I dug in. Cheers!
v-reg, or your really old and full of resistance harness
we need more info.
what is your battery voltage at:
idle?
2000rpm?
3000rpm?
4000rpm?
5000rpm?


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