GPS wired to Tail Light - Not working? - K-Bikes.com - Excellence in Motion
 
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post #1 of 8 (permalink) Old Jul 17th, 2008, 8:01 am Thread Starter
 
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GPS wired to Tail Light - Not working?

I looked like I knew what I was doing as I wired a two devices to my tail light on my BMW K12GT. The first one was a additional break light to make me more visible to cagers. This one works great. The second one was my Zumo 550.

I found my 3 tail light wires and used my extra break light to test the power in the wires. I found the main power and then the 2nd line that goes on when the breaks are hit. That was the easy one. I test the light with the 3rd wire and found the second common wire that made the light work when the breaks were off. So far it sounds pretty simple. These must be the 2 wire I need to attach my Zumo too. Right?

I proceeded with attaching one Zumo cable wire to each of these two wires. I did not have my Zumo on hand for a test, but I was confident that this must be it. I closed everything up and cleaned up.

Several hours later my wife came home with my Zumo. I proceeded to mount the Zumo in the Cradle and start my bike. No dice. It still only runs from the batter inside the Zumo. Given this I guess a few things could be wrong.

1. Perhaps I have the two Zumo wires backwards?
2. Perhaps this is not enough power? I dont think so.
3. Some other issue that escapes me.

Was I wrong in assuming the hot line was the one wire that was common between my brake light and my tail light?

I would sure apreciate your assistance, before I start pulling wires again.
Thx,
Kregg
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post #2 of 8 (permalink) Old Jul 17th, 2008, 9:39 am
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Brown is the color of the -or ground wire.

Bruce C
'04 K1200RS Capri Blue(totaled)
2008 Triumph Sprint ST

Last edited by brucecha; Jul 17th, 2008 at 12:27 pm.
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post #3 of 8 (permalink) Old Jul 17th, 2008, 12:06 pm
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Hope the Zumo has an internal diode to protect it against power line reversal!

If you hang one end of a test lamp on the frame (-VE) , then the wire that lights it is the HOT wire + VE.

When you buy and fit expensive toys on an expensive to fix motorcycle, it's worth buying an inexpensive test meter, which usually comes with red and black test leads for obvious reasons.



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post #4 of 8 (permalink) Old Jul 17th, 2008, 12:38 pm
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I don't know what year your GT is, but I wouldn't wire to the brake lights, anyway. Lots of other places to wire to and without a volt meter you could wire to a line that's only hot when you hit the brakes.

On another note, I was hard wiring a GPS to my pickup, wife and daughter starving and wanting me to take them to dinner, so I got in a hurry. I found a good ground with my fluke and soldered to it. It was to the brake pedal and everytime I hit the brakes it killed power to the GPS. What a bitch.

-=grif=-
What was that middle thang?
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post #5 of 8 (permalink) Old Jul 17th, 2008, 1:28 pm Thread Starter
 
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Thanks for everyones comments. The dealer is the one who suggested the tail light because it is very easy to get too. I must have them swapped. I will try the ground on the frame test and go from there. I have confirmed that the Zumo is protected from reversal.
Thx,
Kregg
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post #6 of 8 (permalink) Old Jul 17th, 2008, 1:33 pm
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Don't use the frame for actually grounding anything. BMW is famous for not having good frame grounds. I always use a brown wire.

-=grif=-
What was that middle thang?
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post #7 of 8 (permalink) Old Jul 18th, 2008, 7:17 am Thread Starter
 
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I just wanted to let everyone know. I swapped the two wires last evening and everything works great!

Thanks for everyones support.
Kregg
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post #8 of 8 (permalink) Old Jul 18th, 2008, 9:41 am
 
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Still lots of time to come to canada for the Return to Trenton Rally August 18,19,20 presented by the Looni-tics pm me and I can tell you more
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