Problem with battery maintainer through accessory plug - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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  • 2 Post By gristle
  • 5 Post By nvr2old
  • 1 Post By Rolex
  • 1 Post By Brockie
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post #1 of 7 Old 11-17-2019, 03:54 PM Thread Starter
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Problem with battery maintainer through accessory plug

I added an accessory plug with usb to my 09 Wee, pic attached. I hardwired it direct to battery so I could backfeed a battery maintainer (600mA) via a male lighter plug. It did not go as planned. Apparently the voltage conversion circuitry in the accessory plug interfered and converted the 12 volts, 0.6mA going in via the maintainer to 5 volts (usb voltage). The 5 volts (not 12 as I surmised) was then fed to the battery via the hard wired battery connection. This drained the battery of course and I think its demise (was going to replace anyway, max voltage now 12.1 volts). I confirmed the 5 volts at end terminals where it connected to the battery with multimeter.
So, the take away is be careful if you have this idea, it may not go as planned. I'm not sure if all of these add on handlebar mount usb/accessory plugs are wired the same and will behave this way, but caution is advised. A separate stand accessory plug without usb should be fine if hardwired directly.
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post #2 of 7 Old 11-17-2019, 04:16 PM
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For battery maintenance I use the direct connector supplied. It also serves a plug-in for my air compressor. Hid away under the seat when not in use.
For a second dash plug(Cig. lighter style) I use a bar mounted one wired direct to the battery so my GPS doesn't need to reboot every time the key is turned off. Have a double USB to go in that when needed.

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post #3 of 7 Old 11-18-2019, 04:50 PM
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I back feed the 12V outlet plug to charge the battery. It's wired directly to the battery through a fuse.
Gotta be careful when doing up the wiring.
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post #4 of 7 Old 11-18-2019, 09:02 PM
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Gristle I find that interesting

I would have thought as you did that there would be a straight connection between the outlet and the battery with no interference from the USB.

I could no resist I would open that sucker up and have a look inside.

I will have a look through my electrical junk bag to see if I have anything similar that I can test, check and open up.
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post #5 of 7 Old 11-18-2019, 09:10 PM
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I use my heated vest lead to charge my battery. It is designed for more current anyway.

"If its not broke yet, it can still be fixed"
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post #6 of 7 Old 11-18-2019, 09:36 PM
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Like Rolex I am surprised that it did not work. I would have presumed that the 12v source was direct wired to the Cig plug, and that wires go from there through a step-down gizmo to the 5v USB.

In that case you should be able to back trickle charge. Have you checked that the Cig plug actually supplies 12volts? It should give you 12.8 or so with ignition off, and 13.5-14 volts with the engine running.
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post #7 of 7 Old 11-20-2019, 03:55 AM Thread Starter
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Normal voltages with bike off and on. Infernal internal circuitry likely culprit, just goes to show the need to test things and never ASSume anything, murphy'slaw and all. I installed a Schumacher SE-1-12S 1.5 amp maintainer onboard full time in the small recessed compartment behind the battery, fits OK there. This set up is allows for a direct battery connection and allows me to have charging capability while about "just in case" as long as I can get access to 120V. I've bump started many a bike in the past (when I was young and too broke to properly fix things) so this is an option if all else fails.
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