Parasitic drain? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 20 (permalink) Old 03-08-2016, 02:24 PM Thread Starter
1986 VN750
 
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Parasitic drain?

Ok I've been having problems with my VN750 for 2 years and am hell bent to get it working correctly.

I have a newer battery all charged up, ready to fire it up for the first time in the nice weather and it cranked about 15 times and the battery died. Needless to say Im annoyed w the battery back on the charger.

1- should the battery be dying so damn fast when it's cranking?
2- Would a bad parasitic drain make this happen as soon as I turn the key and suck juice from the starting amperage?
3- How do I properly test for a parasitic drain? I hooked my meter up in series on the negative terminal set to 10 amps and it started smoking pretty much right away. Now im no fool when it comes to multimeters but obviously something isnt right.

The original issue is that the bike would usually start fine and ride where I want to go but once i get there and try to start it again, the battery would be dead. This is intermittent of course. The low beam usually goes on and off at will also. I'm at such a loss as to whereto start.

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post #2 of 20 (permalink) Old 03-08-2016, 02:52 PM Thread Starter
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test results

So I charged up the battery and tested the amperage with the bike off, key out. I got about 107 mili amps. When I pull the main fuse, the amperage drops to about 45 mili amps. I pulled the headlight and tail fuses out as well just to make sure theres no change and the isn't. Only the main fuse changes the amp draw. Should there be any draw at all with the bike off, key out? It's a 1986 VN750 with absolutely NOTHING extra hooked up to it

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post #3 of 20 (permalink) Old 03-08-2016, 02:57 PM
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Sounds like a bad battery. Is it a wet cell or an AGM battery?

AGM batteries are highly reccomended here...

15 times trying to start the bike sounds like a lot. You might also want to check the charging system.

Go over your ground connections and terminal connections. Then your wires under the seat and the headlight bucket. Look for worn insulation on the wire harness coming out from the front of the tank.

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post #4 of 20 (permalink) Old 03-08-2016, 03:01 PM Thread Starter
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The battery is ok. Had it load tested and was inside charged all winter. Ive gone over all the connections and grounds etc. I think it just cranked that many times because it was sitting all winter. I put the battery back in after charging and it literally fired up on the first crank. My issue here now is, why is the low beam off (comes on occassionally) and why is the battery dead after riding and parked for a few hours.

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post #5 of 20 (permalink) Old 03-08-2016, 03:12 PM
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Again, check your charging system. Start the bike and measure the voltage at the battery. You should be seeing 12.8 volts or so with the bike off and 13.4 and above with the motor running.
Intermittent headlight can be a sign of a bad stator.

The only way I know to check for a parasitic drain it to disconnect the battery and test for resistance on the two battery leads. You should get no reading from 1 to infinity....

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post #6 of 20 (permalink) Old 03-08-2016, 04:06 PM
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Yup Yup.check r&r and stator

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post #7 of 20 (permalink) Old 03-08-2016, 04:27 PM Thread Starter
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The stator seems fine. Charges at about 13.8 and higher when at higher RPM's also no ground or shorts between the 3 leads. Still haven't found a good way to test the rectifier yet. Any advice for that?

Mosfet R/R and relocated
2 wire Mod for the 1986 harness
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post #8 of 20 (permalink) Old 03-08-2016, 04:42 PM
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https://www.vn750.com/forum/showthread.php?t=24093
Check this

ONE RATS ASS GIVEN PER POST
Support your local FREEBIRDS MC
1986/5 Vn700/750 Frankenfook cross eyed bitch "Mellisa Fayhe"
I am a BIKER and i'm proud.FREEBIRDS MC CENTRAL NY

lowered with progessive 412 10" shocks
rejetted for K/N Pods part#rc 2340
sportster seat

'I didn't lose my mind.i gave it away

BRING BACK WOLFIE."Peace and Carrots"RIP
"And I'm free...as a bird"John Lennon Free as a Bird
"I only carry when I have my pants on"Joe Robinson RIP aka Old Dog
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post #9 of 20 (permalink) Old 03-08-2016, 04:43 PM
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https://www.vn750.com/forum/showthread.php?t=49946
And this

ONE RATS ASS GIVEN PER POST
Support your local FREEBIRDS MC
1986/5 Vn700/750 Frankenfook cross eyed bitch "Mellisa Fayhe"
I am a BIKER and i'm proud.FREEBIRDS MC CENTRAL NY

lowered with progessive 412 10" shocks
rejetted for K/N Pods part#rc 2340
sportster seat

'I didn't lose my mind.i gave it away

BRING BACK WOLFIE."Peace and Carrots"RIP
"And I'm free...as a bird"John Lennon Free as a Bird
"I only carry when I have my pants on"Joe Robinson RIP aka Old Dog
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post #10 of 20 (permalink) Old 03-09-2016, 11:27 AM Thread Starter
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I did the blue wire mod and the headlight still does not work. Im thinking maybe theres an issue with the headlight switch or the bulb. Also I found yesterday that I get 140 miliamps at the battery with the bike off and key out. When I pull the main fuse, the draw drops to 45 miliamps. This amperage stays even w all fuses out. Should there be this much draw with the bike off etc? Can someone suggest what/ If any amperage should be present with the bike off, key out?

Mosfet R/R and relocated
2 wire Mod for the 1986 harness
VN750.com grill cover
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