Battery/Charging issue

[jambo]

Ok, battery seems fine.

The reg rec has 5 wires, 3 yellow from alternator to reg/rec. At about 5k they should have around 80v AC between all 3 (1-2, 1-3, 2-3). Plug that back in and unplug the red & black wires coming out. These should give you around 14v DC at 5k.

Jambo
Sent from my thingie

Can anyone give me a quick guide of where the bolts are that holds on the side cowl - I had a quick go and something seems amiss?

Cheers guys. Fwiw I put money on r/r. Because it always is!

[Biker Biggles]

Apart from the obvious ones there is one each side under the raer of the tail unit often obscured by crud from the rear wheel.Roughly just inboard of the indicator stalks.

Finally found a spare morning to have a go and again, another hurdle

The reg/rec on this bike is not standard. And now I recall something about the previous owner telling me its been replaced by a CBR one...

The connector block on the bike is a single block with 3 yellows, 1 black with white stripe and 1 red wire going into it.

The actual reg/rec on the bike currently is bigger than stock - 5 wires coming out of it, 3 black, 1 black with red, and 1 black with white.

There are a few markings on it, all serarate:

RS41
33E2
51
2A10

How do I test/fix this now

[jambo]

Hong, see how that's connected to the loom. The only additional wire is black and white stripe. It'll either be unconnected to anything in which case no need to test, or it'll be connected to the black or red where it hits the loom. In which case test it along with the corresponding color.

Jambo

[aesmith]

Same number of wires isn't it? At a guess, the three Black probably go to the stator (originally Yellow), Black+Red and Black+White go to the battery. A quick check with the meter will confirm this, and also which way round.

I am so out of my depth

Can anyone confirm what regrec I currently have, I'd rather just find another one, throw it on and retest the voltages

[timwilky]

Hong try to give us a diagram, or photo of the connector and wires etc.

On stock, you would expect 3 yellow wires to come from the Alternator plus a pair of wires providing battery connectivity.

Do your 3 black connect to the 3 yellow?

If so I guess the black/red is positive feed to the battery and the Black/white the neg.

The figures you have given show something is out.

Disconnect the wiring from the R/R and measure the AC voltage on the 3 yellow pairs. think of the 3 as a,b,and c. So AB, AC, and BC. You should be getting about 80v, remember to set the multimeter on the ACV setting.

Sorry if this is teaching your granny to suck eggs. But before condemning the R/R it makes sense to ensure that the alternator is doing its job.

Update

Jambo is f*cking awesome and took time out to explain this to me over the phone, so I understood what it was I was actually testing for and why! I now have a decent grasp of how the SV charging system works

Tested across all 3 alternator yellow wires which produced healthy ac voltage (80v @ 6-7k)

Tested voltage was the same on the battery terminals as it was on the other 2 pins on the reg rec connector

Continuity test across the reg rec battery pins

All voltages actually came back in range with the reg rec all hooked up again - so Christ knows how I got those strange results before.

Only difference is this time I had someone holding the multimeter probes for me while I revved the bike. Maybe last time they were not on properly?

Left the battery in the bike all hooked up, shall test v's tomorrow and see what the results are.

But for now I just need to sort the rear end out and it's time for tax / mot - just in time for winter!!