Battery Drain. Please help! - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 37 (permalink) Old 08-28-2011, 08:52 PM Thread Starter
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Battery Drain. Please help!

So I bought the bike a few weeks ago and I knew that it had an electrical issue. The PO told me that he changed the stator, r/r, battery, fuse box, key ignition and pickup coils, but he couldn't figure out what the problem was. The battery kept dying.
I hooked up my multimeter and noticed that something was draining the battery.
From what I understood the drain was caused by the 3 wires coming from the r/r. the brown and white wires are both connected to the positive battery terminal and the black wire is connected to the negative terminal.( I'm not entirely sure that this is the original R/R since i don't see a black and yellow wire.)
The PO must have wired it that way.
It doesn't seem right according to what the wiring diagram says.
Does anyone have any ideas on how to fix this problem?


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post #2 of 37 (permalink) Old 08-28-2011, 09:38 PM
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Well I`m no electrical guru, but it is clear on the wiring diagram that the brown and white wire are not supposed to be spliced together, and neither one should be connected to the positive battery terminal.

Does the engine start and run when it is wired like this?

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
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TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
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post #3 of 37 (permalink) Old 08-28-2011, 09:55 PM Thread Starter
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Quote:
Originally Posted by OlHossCanada View Post
Well I`m no electrical guru, but it is clear on the wiring diagram that the brown and white wire are not supposed to be spliced together, and neither one should be connected to the positive battery terminal.

Does the engine start and run when it is wired like this?
the engine runs fine, but the battery dies after a few rides.
Also i don't even have a brown wire in the harness, but i do have one on the r/r. I only have 3 yellow wires , a white, and a black/yellow (5 wires total, but the diagram show 6 wires). so my harness has 5 wires but my r/r has 6.
So even if I rewire it back, i don't know what to do with the brown wire.
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post #4 of 37 (permalink) Old 08-28-2011, 11:13 PM
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The three yellow wires carry the charging current from the stator.
You can do a quick check of the charging system by looking to see if the headlight gets noticeably brighter when you rev it up from an idle speed of 1100 rpm, up to about 5K rpm.
The volts should rise from about 12.5 V at idle to 14.5-15 V at 5K rpm.


I believe the brown wire goes to the JB to signal the headlight circuit to come on.
There are some threads from earlier this summer with some colored wiring diagrams that will help you, if you can find them. I`ll take a look and see if I can.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/showthread.php?t=9127
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post #5 of 37 (permalink) Old 08-29-2011, 12:05 AM
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The brown wire from the R/R will drain the battery when connected like you have it. Connect it to any wire which has voltage only when the ignition is on. Originally it was connected to a brown wire with a white stripe.
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post #6 of 37 (permalink) Old 08-29-2011, 02:06 AM Thread Starter
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I dont want to wake up the neighbors, so I'll check the charging system tomorrow.
I did however connect the brown wire to the brown/white wire and it seemed to help, but something is still draining it.
i connected my multimeter between the negative battery terminal and the harness like the manual said to do and it reads 66mA with the white wire connected to the battery and 1.7mA with it disconnected.
the manual says that it should be 1.2mA or less.
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post #7 of 37 (permalink) Old 08-29-2011, 11:37 AM
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Quote:
i connected my multimeter between the negative battery terminal and the harness like the manual said to do and it reads 66mA with the white wire connected to the battery and 1.7mA with it disconnected.
the manual says that it should be 1.2mA or less.
You mean positive battery terminal and harness? And by white wire you mean the white wire from the R/R (which actually changes to red in your picture)?

In that case you have a low quality (chinese) R/R which discharges the battery in a week.

Does that 1.7mA drop if you remove the main fuse? If yes, does it drop if you disconnect the ignition switch? That 1.7mA is not so bad, it takes months to drain the battery.
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post #8 of 37 (permalink) Old 08-29-2011, 02:53 PM Thread Starter
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Quote:
Originally Posted by pappa View Post
You mean positive battery terminal and harness? And by white wire you mean the white wire from the R/R (which actually changes to red in your picture)?

In that case you have a low quality (chinese) R/R which discharges the battery in a week.

Does that 1.7mA drop if you remove the main fuse? If yes, does it drop if you disconnect the ignition switch? That 1.7mA is not so bad, it takes months to drain the battery.
The main fuse did drop it and so did the acc fuse. Ill check the ignition switch when I get home.
I'd be happy with 1.7mA
Ill swap out the r/r with the one on my parts bike and get back to you guys.
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post #9 of 37 (permalink) Old 08-29-2011, 04:54 PM
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The black wire is battery ground (-)
The white wire is the battery charging wire positive (+)
The brown wire is a control wire. It is used by the R/R to determine when to "shunt" excess voltage to ground. It is a voltage "monitor" wire. It needs to be switched (by the keyswitch) so as not to have the control circuits energized whilst the bike sits waiting for you to ride it.

The headlight relay in the jb is switched and latched in by signal on one of the yellow AC wires from the stator. One of the yellow wires is split to both the R/R and the JB.

hope that helps.
.

~~C8> Ratt
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post #10 of 37 (permalink) Old 08-29-2011, 05:31 PM
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Z Explains the funtion of the wires to a T. Im surprised no one mentioned just to get rid of that original R/R and replace it with a Mosfet R/R kit. In that case the Brown, WHT/R and the Black wire can be cut and taped up not to be used.
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