Checking the charging system? - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 12 (permalink) Old 09-15-2013, 02:27 PM Thread Starter
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Checking the charging system?

Guys if your headlights are unplugged while checking readings at the battery with meter,will this cause higher readings? I was getting 16+ readings while the bike was running...
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post #2 of 12 (permalink) Old 09-15-2013, 02:56 PM
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You shouldn't get more than 15 in any case dude

How is your battery? 12.8V no terminals connected?

If your battery's good, you probably need a new regulator/rectifier!

You also need this US VERSION RC51 Factory Service Manual SP-1 and SP-2


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post #3 of 12 (permalink) Old 09-15-2013, 03:13 PM
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Can you run the test with them plugged in and working right?

John, 2000 RC51 #000100

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post #4 of 12 (permalink) Old 09-15-2013, 04:19 PM Thread Starter
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It's a Shorai battery,bike not running its at 13.2... I will get some lights and do the test.I was thinking with no lights it would have all that xtra charge and read higher than 14+ But it seems like Makis says regardless it should read the normal specs...
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post #5 of 12 (permalink) Old 09-15-2013, 08:55 PM
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The charging system should never exceed 15.5 volts!!
If your system is at 16 volts, don't ride the bike until you get the problem fixed.

With a lead-acid battery, the risk is the battery can get overcharged and boil the electrolyte and build internal pressure inside the battery.
This can potentially cause the battery to explode.

I have a buddy who had this happen on his Suzuki while on a trip.
He had no idea his rectifier/regulator had malfunctioned until the battery exploded, and not only dumped acid on everything, the power surge destroyed anything and everything electrical and electronic.

On a lithium battery, over-charging could potentially not only cause the battery to explode, but also catch fire, along with the bike.

A few months ago, Cal Crutchlow's pit garage caught fire.
The cause was found to be the bike's battery powered starter unit, which used lithium batteries that were damaged somehow.

Last edited by SubSailor; 09-15-2013 at 08:57 PM.
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post #6 of 12 (permalink) Old 09-16-2013, 11:04 AM
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13.2 is fine for the battery, but like the others said, if the system while running is over x voltage you need a new regulator. headlight on or off shouldn't matter.
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post #7 of 12 (permalink) Old 09-21-2013, 12:38 AM Thread Starter
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Well In another thread I have about how to use the multi meter and where the little dial should be at for checking certain things...Im not familiar with these at all...But figuring it out...I checked the stator and getting .5 across within spec from what Im reading and all 3 to ground with no readings at all,so that's good...I plugged everything back up and fired it up no 16 readings but climbing above 15.58..I think I might do the rectifier mod..(MOSFET type)... I'm just wondering if I do that just replace the stator also? Better safe than sorry or if ain't broke don't fix it logic...Opinions?
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post #8 of 12 (permalink) Old 09-21-2013, 08:56 AM
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I think your stator is as good as new.

Just the reg/rec replacement should do the job just fine.

As far as the multimeter

V --- is for direct current such as the battery or the red and green lines coming from the R/R

V~ is for alternate current which is what you measure by hooking up 2 yellow lines, coming from the stator, at the time. Notice that you should measure close to 20V A.C at idle so use a large scale first.

Ω is for measuring resistance.


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post #9 of 12 (permalink) Old 09-21-2013, 12:08 PM Thread Starter
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Thanks Makis
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post #10 of 12 (permalink) Old 09-21-2013, 05:44 PM
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Just my related experience...

I have a shoria, it always reads 13 to 13.2
I have done the mosfet r/r mod and doing that solved my PC problem.
At ideal voltage should never be more than stated.


Well dinner is ready, PM if you need more information.


James

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