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  #1  
Old 31 Oct 2005
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12v Socket on an XR650R - How ???

Hi guys, im taking an XR650R around South America and i want to fit 12V socket to power a Garmin Quest GPS and maybe other things. As the XR doesnt have a battery, hows the best way to do this ?? WIll the generator be able to handle it and will the AC current mess it up at all ?

All info will be gratefully recieved

Cheers, Ed
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Old 31 Oct 2005
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I wired my GPS in via the kill switch and headlight wires so that the socket/power supply was fully on the handlebars for whenever I had to dismantle the bike for airfreight. I remember thinking it would be AC, but its DC. (I think!)
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Old 1 Nov 2005
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Hi
Yes I did the same as Richlees. and it IS DC voltage.

I used the electrical diagram in the owners manual to find a source.

works well. the coil is THAT powerful so dont expect to boil water....
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Old 1 Nov 2005
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Does this mean that the power socket will supply a 12v DC output ??

The garmin quest im looking at has a Ac converver intended for cars.. will this still work fine..

I was told that i would also need a Rectifier too ! yes ??
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Old 1 Nov 2005
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as Karim has already confirmed my recollection, yes it does mean you get recitified 12V DC. I've no idea about your AC needs
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Old 1 Nov 2005
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There are aftermarket 12 volt sockets similar to the cigarette lighter for motorvehicles & bikes which you could mount anywhere on your frame with a small metal plate. You could connect it via fuse directly to the (12V DC) battery. See that the connections are properly sealed against moisture. The socket should have a hinged cap.
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Old 1 Nov 2005
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Thats the problem mate... there is no battery

From what I can gather now, i am going to have to take a feed after the rectifier on the bike, and put an inline regulator in it and probably a capacitor.. This way ill have a steady 12V Dc output. Ill probably go for a 2amp regulator.
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Old 1 Nov 2005
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no need to add another regulator - its 12v DC
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Old 1 Nov 2005
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I will need a regulator to give the correct amperage as the bike puts out a much higher amperage that the GPS uses.

http://www.visordown.com/forums/show...73#post2549973

[This message has been edited by tedmagnum (edited 01 November 2005).]
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Old 2 Nov 2005
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I have used the bikes power directly with 3 different garmin gps's and they all work well under severe conditions.

I do not have a battery on the bike. I measured the voltage at the point where I cut the wire into the loom and it was 18V DC(ok)

hope this helps
Karim
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Old 2 Nov 2005
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I'm not sure how to pitch this so forgive me if I'm teaching grandma to suck eggs etc, but a device draws the current (amps) that it needs according to the voltage supplied. voltage = current x reistance (V=IR). Karim and I have confirmed you have the right voltage and Garmin have built a GPS of the right resistance. so current will take care of itself.

If the GPS only needs a few miliamps, it will only draw a few miliamps. I don't understand your logic in regulating the current.
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Old 2 Nov 2005
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I have no doubt that your right and im talking doo doo

I was just quoting what another forum told me.

As you can guess im a novice at electrics but learning slowly.

I really do appreciate the help

So i should just wire in the GPS anywhere which is DC on the bike and it should work fine? even if 18V is being put into it?forgive my ignorance??

[This message has been edited by tedmagnum (edited 02 November 2005).]
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Old 2 Nov 2005
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Hey, I quite forgot that it was possible to use a vehicle whatever without battery. But yes, I remember my old buzzbike years ago didn't have one either ;-)

What Rich says is correct: you don't need to regulate the amps. The device only draws as much as it consumes. I'm not so sure about the voltage though if the Garmin device regulates this by itself. It is quite easy to make sure the voltage is DC and does not exceed a defined limit with a bridge rectifier and a zener diode behind it with the correct voltage limit. Any electronic shop should be able to assist you.
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Old 3 Nov 2005
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who told you 18v? did you measure it on your bike (implying a problem) or were you told that on another dodgy forum ;-)

The bike generates 12v DC so you need to find a positive and a negative and connect to these. eg both go to the light, but you need to be careful about switching between high and low beam. and you don't want to use the indicator wiring if you have the flasher relay or the GPS will switch on and off ;-)
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Old 3 Nov 2005
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The bike doesnt generate 12v dc, it produces ac which as far as i was informed creates voltage depended on the speed, windings of the alt. So at full throttle it could create 18v (actually its max output is 13.5). This is and regulated then put into the lighting etc.

I didnt really want to put it into the lighting as this will suck power and the XR's headlamp runs of AC anyway. The main problem is that the bikes reg/rec is notoriously "agricultural" and will not respect the sensitive gps.

The solution is: ...

"If you only need a few milliamps then the whole thing is fairly simply.

Presumably the alternator is a single winding with one side earthed, in this case a single diode(rectifier) feeding a smoothing capacitor - say 470uF, 100v rating in parallel with a 0.1uf capacitor to remove the high end frequncy and then through a regulator with the appropriate output voltage rating (7805 = 5v, 7812 = 12v etc). Output of regulator should have a small cap to gnd, 4.7uF or so.

The pulsing of the light suggests a fairly low frequency - if the gps has pulls too much current the voltage could dip excessively on the -ve cycles, if this happens increase the 470uF capacitor. I would reckon 470uF is probably fine if you're pulling less then 50mA though...


[This message has been edited by tedmagnum (edited 03 November 2005).]
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India 2012
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South America 2014
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