Inconsistent voltage - Honda Rebel Forum
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post #1 of 13 Old 04-07-2019, 12:30 AM Thread Starter
 
Join Date: Apr 2018
Location: St. Maarten/St. Martin, - "Wayward Islands"
Posts: 25
Inconsistent voltage

Light brightens when revved & flickers dimmer & brighter at constant revs. New battery about a month ago, cleaned terminals & even used a jumper wire to see if the ground to the frame needed cleaning. I'm guessing regulator, but would like to know before ordering parts since I have to have things shipped or flown in to our "Rock". It's my '09 Rebel 250. Where do I kick it to clear this up ?

09 Rebel 250
St. Maarten/St. Martin. 45 yrs. in Caribes.

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post #2 of 13 Old 04-07-2019, 04:29 PM
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Mine was doing something similar with the LED light I installed. Turned out the connection between the light and harness was loose. It's normal for the light to brighten when the engine is revved and dim at lower rpms.

Keepin' all the left over parts. Gonna use 'em to build another bike!

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post #3 of 13 Old 04-07-2019, 08:28 PM Thread Starter
 
Join Date: Apr 2018
Location: St. Maarten/St. Martin, - "Wayward Islands"
Posts: 25
No LED lights and the only time I had a similar thing happen, the battery was about gone. Otherwise, the neutral light & headlight have kept even brightness. Doesn't the system run on the battery, with the alternator just charging the batt. ? If so, the brightness should remain constant, shouldn't it ? Anything that changes, catches my attention. Have new batt. & think it must be the "wreck-ti-fier". No problems with starting, driving etc.. Just want to correct whatever it is before it fries my batt. or something else.

-- snipped --

09 Rebel 250
St. Maarten/St. Martin. 45 yrs. in Caribes.

Pessimist: Optimist with experience.
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post #4 of 13 Old 04-07-2019, 08:57 PM
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The Rebel engine can run with a dead battery.

Keepin' all the left over parts. Gonna use 'em to build another bike!

'01 & '09 Rebel 250, '06 Ninja 250, '89 VN 750
Putting your bike year and model in your signature helps others help you!
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post #5 of 13 Old 04-07-2019, 10:40 PM Thread Starter
 
Join Date: Apr 2018
Location: St. Maarten/St. Martin, - "Wayward Islands"
Posts: 25
Battery gives strong starts. I'm just going to stick a new rectifier on it & see. Hope they have one on the French side. Ordering from off Island can be slow. Now, where is the bloody rectifier ? I can seem to find a diagram/pic of where it is. Under the tank ? I'm going to mount the seat & tank with Velcro yet !

09 Rebel 250
St. Maarten/St. Martin. 45 yrs. in Caribes.

Pessimist: Optimist with experience.
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post #6 of 13 Old 04-07-2019, 11:05 PM
 
Join Date: Nov 2016
Location: Chandler, AZ
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In have never had what you are describing on a Rebel. The stator output drops at idle, but you are right, the lights run off the battery. First, check the charging system. Get a multimeter, set it on volts, and connect the leads to the battery terminals. With the engine off, it should read right around 12V. With the engine idling it should drop down into the 11V range, because the lights and ignition are drawing more power than the stator puts out. Then rev it up a bit, and you should see readings in the 14V range, and they should be steady. Voltage should not fluctuate. If it does, you have a bad RR (regulator/rectifier) a bad stator, or a loose connection somewhere. It could still be a bad ground to the lights even if the battery has a good chassis ground. You could take a piece of wire and ground the lights directly to the battery and see if it makes any difference. The Rebel has a fairly simple electrical system, so with some patience it shouldn't be that difficult to track it down with a multimeter.
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post #7 of 13 Old 04-08-2019, 12:36 AM Thread Starter
 
Join Date: Apr 2018
Location: St. Maarten/St. Martin, - "Wayward Islands"
Posts: 25
Thanks everybody. I'll play around with it some more, but think a new r/r is probably in order. Gotten good advice on this forum & like learning about other people's experiences.

When all else fails, read the instructions.

09 Rebel 250
St. Maarten/St. Martin. 45 yrs. in Caribes.

Pessimist: Optimist with experience.
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post #8 of 13 Old 04-08-2019, 12:56 PM
 
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pull the headlight bulb out of the bucket, plug it into the socket, and with the bike just switched on, wiggle them and make sure its not a bad bulb prong or wire in the bulb plug...
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2009 Honda Rebel 250; 2009 Honda Shadow 750 Spirit
"The bravest thing for me to do is admit when I am wrong" - unknown
HRF Answer #1 You should take the MSF Rider Course
HRF Answer #2 You need to clean your carburetor
HRF Answer #3 Sorry we assumed if you didn't say otherwise
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post #9 of 13 Old 04-08-2019, 09:02 PM Thread Starter
 
Join Date: Apr 2018
Location: St. Maarten/St. Martin, - "Wayward Islands"
Posts: 25
Kytron, the neutral light does the same merde. Ck'd batt. today & shows normal. Observing closer, I see that what I am observing is the lights go brighter & immediately go back to normal brightness. That indicates to me that the r/r is giving a high voltage momentarily to the battery. Still thinking r/r problem. Sailing up to St. Thomas next weekend & see they have a dealer on "Butt Rd.". Surely have an r/r. Want to get it working right before I fry my new battery ! Where the h*ll is the r/r located ? Is it under the tank ? All the sites I've looked at seem to avoid telling me. I'm an aircraft mechanic (A&P), so have the tools, but not a bike mechanic. Learned long ago to learn from other people's experience & mistakes.

Problem ? Always look at the last thing worked on 1st.
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09 Rebel 250
St. Maarten/St. Martin. 45 yrs. in Caribes.

Pessimist: Optimist with experience.
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post #10 of 13 Old 04-09-2019, 06:00 AM
 
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up and forward, in the fuel tank tunnel-ish area above the spark coils, it is the only electrical component with heat-sink-cooling-fins on it.
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2009 Honda Rebel 250; 2009 Honda Shadow 750 Spirit
"The bravest thing for me to do is admit when I am wrong" - unknown
HRF Answer #1 You should take the MSF Rider Course
HRF Answer #2 You need to clean your carburetor
HRF Answer #3 Sorry we assumed if you didn't say otherwise
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