Electrical problems - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
DL650 and DL650A - 2004 to 2011 DL650 from 2004-2006 (K4-K6) and DL650 or DL650A from 2007-2011 (K7-L1)

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post #1 of 25 Old 12-09-2018, 10:57 PM Thread Starter
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Unhappy Electrical problems

Ok Internets, I need help!



Here is the deal. 2007 650. Seems like the electrical system is over worked. When I grab the brakes, the headlight visibly dims. When I turn on flashers or turn signals, headlight dims in time to the flashers. I can also hear the fuel pump pitch change with the flashers (bike runs fine).

What I have checked/done:
Brand new Battery

Battery sits at about 13.4 volts at idle. Drops a little bit 13.1-13.2 when revved.

Regulator/rectifier passed the test in the service manual, all numbers in spec.

Stator passed tests in the manual too.

Cleaned up ground and positive connections at battery. Should probably check ground to frame connection.



This may be unrelated, but it occasionally blows the fuse for the signals (ie dash lights/guages, turn signals etc) seems to happen when I shut the bike off or turn it back on, but of course I cant recreate is so not sure.


Whats next to try??

Thanks!!
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post #2 of 25 Old 12-09-2018, 11:00 PM
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Blows the fuse ... there's your culprit. Most likely a bad ground or intermittent short on that circuit. You'll need a test lamp and multimeter to troubleshoot.

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post #3 of 25 Old 12-10-2018, 02:51 AM
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Those things are normally associated with a bad earth.

Check the main cable where it meets the motor and the big plug on the left side up near the radiator as first points after that is keep looking you will find it eventually.

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post #4 of 25 Old 12-10-2018, 03:02 AM
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A bad ground wont blow a fuse, but an intermittent short certainly will.
13.4 @ idle is too low, drops when revved is not what you want.
Battery--new means just that, new, not necessarily good.
Any aftermarket lighting equipment or wiring on this bike?
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post #5 of 25 Old 12-10-2018, 08:44 AM
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Actually the fuse blowing may be a key. I would carefully inspect the battery to frame grounds, and every ground I can find. The dimming of other circuits when turning on others is often a grounding issue. There can be weird circumstances where current uses another circuits ground path to complete the circuit. Follows the path of least resistance. This stray current can overload other circuits causing fuses to blow. This is pretty rare however. Unless you have some wiring issues caused by harness damage or improper connections for accessories.

But, we need to know if the "new battery" was installed AFTER these problems started?

If so, has this battery been charged fully before installing?

Because 13.2 volts revved up tells us the stator has failed.

The dimming as the lights come on can in fact be a ground, but it can also be the charging system failing to maintain an even voltage under changing loads. Which is usually going to be a stator failure.
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post #6 of 25 Old 12-10-2018, 09:22 AM
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My experience with my '01 SV650 could be apples to oranges compared to gen 1 Wee so feel free to disregard this. The symptoms that I had were similar to the OP's......At idle 13.8V. When RPM goes above 2500 the voltage reading starts to drop and winds up at 13.2 and stays there. Gen 1 Sv's were noted for having bad reg/rects. I replaced it with a series type r/r, beefed up the wiring from the stator to the r/r and solved my problem. The last thing that I want to do is complicate the issue for the OP so somebody chime in.

'01 SV650N
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post #7 of 25 Old 12-10-2018, 10:24 AM
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Before reading too much into the slight "battery ... drops" observation, the locations at which that voltage was measured should be considered. If one voltmeter lead was to the frame or some other part of the ground system other than the negative terminal of the battery, that drop likely indicates only a somewhat resistive set of connections. If the measurements were taken at the battery terminals, then I agree that the stator may be implicated. Given that the OP did the checks listed in the service manual, (which I recall involve AC voltage measurements with the stator disconnected), it would then be worthwhile to look for continuity between the stator windings and the engine. There should be no such continuity when the 3-wire stator connector is disconnected.

As others have noted, a poor ground system connection could be involved. After verifying that the stator is not failing, I would look for excessive voltage drops between different parts of the ground system, including across that block connector that connects the panel and carries headlight current through a single, overloaded pin pair.
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post #8 of 25 Old 12-10-2018, 12:23 PM
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Any recent electrical mods been done lately?

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post #9 of 25 Old 12-10-2018, 07:51 PM Thread Starter
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Thank you for all the replies!!!

I will answer the group as a whole here.




The electrical system is bone stock. No extra lights etc.

So the battery may have been installed after the light flickering started, or not lol. I'm not sure when that began. I got this bike in April, and didn't ride in the dark much at all, so may not have noticed. However the fuse blowing is post new battery. Battery was bench charged before install. Don't remember if I checked voltage on it off the bench, oh well.

Voltage has been measured at the battery terminal, not the frame.

I am going to go check grounds and the stator to engine test that trepidator suggested. I shall post back with updates.


Thank you all again I appreciate it!!
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post #10 of 25 Old 12-11-2018, 02:47 AM
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A poor earth will also give you a unreliable voltage reading.

A fuse will pop when the current is greater than the fuse is designed for and as voltages changes so do currents, it could be that everything is now being powered through that fuse as it is the only earth it can find.


This is where we miss GW, there was a year that the wires rubbed through on the frame on the left side between the seat and the foot peg, GW would remember what year that was.

Some of the 19 rides in my shed
2014 V2, Snoopy
2009 Wee, Pumbaa the pig
WR450F, The Blue Postie Bike
YZ250N smoker with rego, Stinky.
Yamaha MT09 (FZ09), The Scud missile.
Club Lead not Club Med.
He with the most toys wins.
Out of my depth in a puddle.
Live life on the edge you will see more that way.
Ridding a motorcycle keeps things in balance.
At the end of each trail and at the end of each day history is made.
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