No battery again. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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Where does this wire go?
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post #1 of 37 (permalink) Old 03-19-2013, 04:04 PM Thread Starter
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No battery again.

So this morning I tried to start the bike and it turned over a few times then I was out of battery power to start it. Had to jump it with a car battery.

I still took it to work (about a 10-15 minute ride), knowing well that I might have to come back in a taxi... but I had no other choice and it was getting late for work, so I rode the bike and got to work just fine.

When I got off work I told this guy who works there that my bike might not start so if I had to leave it there, to please keep an eye on it and I'd come back later to get it.

Went up to the bike and it fired right up, not a second of hesitation!

So I know the bike is charging the battery, cause I've measured the voltage and the bike puts out 13-14.5 Volts measured at the battery terminals. Also because the battery got a good enough charge to start the bike after just a 10 minute ride.

So what else could it be? Bad battery? Electrical draw even when the bike is off? How can I tell what it is?

I'd like to add that both times this has happened, it happened after the weekend... I don't ride my bike during the weekend.

1985 VN700 unknown mileage (over 33K)

AGM Battery
Iridium spark plugs
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Relocated R/R
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post #2 of 37 (permalink) Old 03-19-2013, 04:21 PM
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Could it be the brown wire you changed around last week?

If you think there's a draw, take a battery cable loose and touch it to the battery with the key off, see if there's any spark when you touch the terminal to the battery.
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post #3 of 37 (permalink) Old 03-19-2013, 04:34 PM Thread Starter
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It shouldn't be the brown wire since it comes from the R/R and not the bike's wiring... also because it's only supposed to be a sensor for the RR, but I'll check it anyway. I'm gonna try that and see if it sparks.

I do have more connections there than I should... I grounded a pin on the junction box to bypass all the safety switches and I put in the coil relay... and possibly something else that I don't remember.

1985 VN700 unknown mileage (over 33K)

AGM Battery
Iridium spark plugs
NGK wires and caps
Relocated R/R
Marbled
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post #4 of 37 (permalink) Old 03-19-2013, 04:56 PM
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If you have a VOM or a test light check it for parasitic draw. Its easy. Take the positive cable off the battery. One end of the VOM or test light goes to the battery post, the other to the cable. If the VOM reads current or the test light comes on you will have found your problem. Engine off, key off.
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post #5 of 37 (permalink) Old 03-19-2013, 05:15 PM Thread Starter
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Quote:
Originally Posted by wmsonta View Post
If you have a VOM or a test light check it for parasitic draw. Its easy. Take the positive cable off the battery. One end of the VOM or test light goes to the battery post, the other to the cable. If the VOM reads current or the test light comes on you will have found your problem. Engine off, key off.
That would be... one end of the VOM to the negative post and the other to the positive cable that I disconnected? Or the VOM between the positive post and the positive wire I disconnected?

1985 VN700 unknown mileage (over 33K)

AGM Battery
Iridium spark plugs
NGK wires and caps
Relocated R/R
Marbled
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post #6 of 37 (permalink) Old 03-19-2013, 05:31 PM
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Positive post and positive cable. Probably best to use a test light, leave it hooked up where it is easily seen . Disconnect things/wires till it goes out. Doing automotive repair I start by pulling one fuse at a time.
If the light does not come on, you have no parasitic loss AT THAT POINT IN TIME. I am yelling from frustration at myself.

Last edited by wmsonta; 03-19-2013 at 05:33 PM.
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post #7 of 37 (permalink) Old 03-19-2013, 06:40 PM
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How far do you ride to work? It's possible that even though the bike is charging the battery when it's running, your not running it long enough to fully charge the battery.

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post #8 of 37 (permalink) Old 03-19-2013, 07:47 PM Thread Starter
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Quote:
Originally Posted by Knifemaker View Post
How far do you ride to work? It's possible that even though the bike is charging the battery when it's running, your not running it long enough to fully charge the battery.
It's only a 10 minute ride... maybe around 4 miles.

Really sucks that my battery tender got fried. I'll try to replace it as soon as possible.

I don't have any problems during the week though, just when the bike sits for the whole weekend.

I tested it yesterday, precisely because it happened last week, but it started fine. However, it was already warm outside and when it's cold (like this morning) it has a bit of a harder time starting.

1985 VN700 unknown mileage (over 33K)

AGM Battery
Iridium spark plugs
NGK wires and caps
Relocated R/R
Marbled
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post #9 of 37 (permalink) Old 03-19-2013, 07:52 PM
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battery might just not have any cold cranking amps left in it

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post #10 of 37 (permalink) Old 03-19-2013, 08:38 PM
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Quote:
Originally Posted by Ceal View Post
It's only a 10 minute ride... maybe around 4 miles.

Really sucks that my battery tender got fried. I'll try to replace it as soon as possible.

I don't have any problems during the week though, just when the bike sits for the whole weekend.

I tested it yesterday, precisely because it happened last week, but it started fine. However, it was already warm outside and when it's cold (like this morning) it has a bit of a harder time starting.
How cold was it this morning Ceal?
(I suspect what you call cold, and what I call cold are not the same thing. )

Gordon

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Purchased May 16, 2008
Approx.19,300km (12,000 miles)

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