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jaybeblue
Occasional Visitor
Joined: Jun 25, 2007
Posts: 17
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 Posted: Mon Sep 22, 2008 8:49 am Post subject: Flat battery |
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I have been using a TomTom Rider 2 on my motorcycle for 9 months without any problems. Just recently, the motorcycle battery has been going flat after a few days of not being used. My motorcycle dealer checked it out and discovered that the GPS holder is drawing current even when the GPS is not in it. If the cable to the holder is unplugged then there is no current draw so it is definitely the holder and not the wiring.
I put a meter across the two holder terminals and there is a circuit between them (although with some resistance which is why current is being drawn).
Has anyone else had a similar problem?
I'm going to take it up with TomTom because I can't see why a holder should draw current when the GPS isn't in it. |
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M8TJT
The Other Tired Old Man
Joined: Apr 04, 2006
Posts: 10118
Location: Bexhill, South Sussex, UK
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| Posted: Mon Sep 22, 2008 9:01 am Post subject: Re: Flat battery |
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| jaybeblue wrote: | | and discovered that the GPS holder is drawing current even when the GPS is not in it. |
It would be useful to know how much current is being drawn with no TT in the holder. If this is in the region of a few 10s of miliamps, this is unlikely to be your problem. However the current is a lot higher than this, it could quite likely be the cause of your problem.
Perhaps another Rider owner will measure the quiescent current and let us know what their unit draws for reference. |
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jaybeblue
Occasional Visitor
Joined: Jun 25, 2007
Posts: 17
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| Posted: Mon Sep 22, 2008 10:27 am Post subject: Re: Flat battery |
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| M8TJT wrote: | It would be useful to know how much current is being drawn with no TT in the holder. If this is in the region of a few 10s of miliamps, this is unlikely to be your problem. However the current is a lot higher than this, it could quite likely be the cause of your problem.
Perhaps another Rider owner will measure the quiescent current and let us know what their unit draws for reference. |
That's a good suggestion.
What I can't understand is why it would draw any current if the GPS is not in the holder. |
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Darren
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Joined: 11/07/2002 14:36:40
Posts: 23848
Location: Hampshire, UK
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| Posted: Mon Sep 22, 2008 10:32 am Post subject: |
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The holder contains 12v - 5v reduction circuitry. This will draw some current even when not connected to a RIDER.
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Darren Griffin |
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jaybeblue
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Joined: Jun 25, 2007
Posts: 17
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| Posted: Mon Sep 22, 2008 11:01 am Post subject: |
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| Darren wrote: | | The holder contains 12v - 5v reduction circuitry. This will draw some current even when not connected to a RIDER. |
Do you know what the 4 connectors between the holder and GPS are for?
I'd guessed that one would be +ve, one would be -ve and the other two were a switch to apply power to the holder when the GPS is inserted. I think I'm going to have to dismantle the holder to find out. |
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Darren
Frequent Visitor
Joined: 11/07/2002 14:36:40
Posts: 23848
Location: Hampshire, UK
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| Posted: Mon Sep 22, 2008 11:05 am Post subject: |
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One of them tells the RIDER it's in the cradle and activate the 'Safety Screen' when moving.
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Darren Griffin |
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