GPS causing complete electrical shutdown - BMW Luxury Touring Community
 
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post #1 of 7 Old Jun 10th, 2008, 11:01 am Thread Starter
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Angry GPS causing complete electrical shutdown

On Sunday I connected my Garmin 2730 which I've had for a couple of years, to my 99 LT. On two occasions the bike suffered a complete electrical shut-down. A wiggle of the wires and full power returned. The bike ran fine all day. All fuses are sound. The wiring is permanently installed using the Garmin-provided wiring harness. It is hard-wired, through a relay, to the + and - terminals of the battery. The connections are all clean and tight. I move the unit back and forth between the bike and my car. In my car the GPS very occasionally will re-start or otherwise exhibit unanticipated actions such as flashing the map from small view to large. On the bike it does the same thing, but more frequently. All of this indicates (to me, anyway) some type of infrequent electrical short in the GPS unit. Garmin will be glad to look at the unit for a minimum of $270, thank you very much. In short, GPS installed = intermittent complete electrical shutdown. GPS not installed = no problem. All of this started after I installed PIAA lights last month. The lights work fine all the time.

What does all this mean?

Charlie
99 K1200LT
85 R80RT
81 R100RS (Sold it 4/10)
03 Moto Guzzi V11 LeMans
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post #2 of 7 Old Jun 10th, 2008, 11:10 am
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Re: GPS causing complete electrical shutdown

I would look at the wiring on the LT that the GPS attaches too. It sounds like the pos+ is grounding out.

Bob Brendel
05 LT, Light Metallic Yellow
99 LT, Totaled 3/09
97 HD Former Work Bike
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post #3 of 7 Old Jun 10th, 2008, 1:21 pm Thread Starter
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Re: GPS causing complete electrical shutdown

Checking the battery terminals was the second thing I did, right after verifying the fuses were not blown. Regardless, why would a malfunctioning GPS cause the entire electrical system to shut down ... no clock, no lights, no nuthin?

Charlie
99 K1200LT
85 R80RT
81 R100RS (Sold it 4/10)
03 Moto Guzzi V11 LeMans
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post #4 of 7 Old Jun 10th, 2008, 1:51 pm
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Re: GPS causing complete electrical shutdown

I'm thinking that the wire(s) between the battery and the GPS unit are grounding out. Might be a pinched/bare wire that is exposed and intermittently touching the frame causing the electrical system to shut down. If you wiggle the wire and that fixes the problem for a while then check the wire, since it doesn't happen when you put the GPS in the cage.

Bob Brendel
05 LT, Light Metallic Yellow
99 LT, Totaled 3/09
97 HD Former Work Bike
88 GL1500
84 GL1200
S3 400 Kaw, too long ago to remember the year
175 Yamaha even longer

People sleep peaceably in their beds at night

Only because rough men stand ready to do violence on their behalf

George Orwell
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post #5 of 7 Old Jun 10th, 2008, 2:07 pm Thread Starter
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Re: GPS causing complete electrical shutdown

I hate tracking down intermittent electrical problems almost as much as I hate fixing plumbing problems. But I agree that it's gotta be a bad ground somewhere.

Charlie
99 K1200LT
85 R80RT
81 R100RS (Sold it 4/10)
03 Moto Guzzi V11 LeMans
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post #6 of 7 Old Jun 10th, 2008, 3:19 pm
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Re: GPS causing complete electrical shutdown

Intermittent is so much fun. Almost as much fun as having a tooth pulled.

It might be easier to just run new wiring to the GPS. Save a lot of (*&%^ and

Bob Brendel
05 LT, Light Metallic Yellow
99 LT, Totaled 3/09
97 HD Former Work Bike
88 GL1500
84 GL1200
S3 400 Kaw, too long ago to remember the year
175 Yamaha even longer

People sleep peaceably in their beds at night

Only because rough men stand ready to do violence on their behalf

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post #7 of 7 Old Jun 10th, 2008, 3:21 pm
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Re: GPS causing complete electrical shutdown

Quote:
Originally Posted by BMWCharlie
I hate tracking down intermittent electrical problems almost as much as I hate fixing plumbing problems. But I agree that it's gotta be a bad ground somewhere.
Hmmmm, what happens if you start up the 2730 using the factory A/C cable?

Do you still get the same flashing screens?

Perhaps you have corrupted firmware that needs attention?

Just a thought. I swap my 2720 back and forth between car and bike all the time.

J. Averill Townsend
Bloomfield Hills, MI


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