Voltage problem on Rider 550 motorcycle support

[Micky84]

Hello everyone,

I hope you are well.

I have a voltage problem with the motorcycle mount of my TomTom Rider 550.
Indeed, the GPS isn't being detected on its mount because, after checking, I have 12 volts of output voltage on the two small gold pins of the mount.
So I sent the mount and my GPS (still under warranty) for repair to TomTom.
When the equipment was returned, the service report indicated that no defects were found and that, as a preventative measure, the GPS mount was replaced.
BUT, the GPS still isn't charging on its new mount.
When I measure the output voltage on the new mount, I still have 12 volts. After checking, it is clearly indicated on the back of the mount:
Input: 12V - 24V // Output: 5V
What could be the problem? Could there be a manufacturing defect in a series of motorcycle mounts?

Thank you in advance for your help.

Michael

 

[Willy875]

Hi

Do you know anyone who has the same GPS as you and can test it on the same mount as someone else's?

If the mount has 12 volts output instead of 5V, I wonder if that might have already burned out the GPS?

 

[Micky84]

Hi

Do you know anyone who has the same GPS as you and can test it on the same mount as someone else's?

If the mount has 12 volts output instead of 5V, I wonder if that might have already burned out the GPS?

Hello,
Thank you for your reply.
No, unfortunately, I don't know anyone who has a GPS mount or the same GPS as me.
The GPS still works and charges when I plug it in with its USB cable (the surge protection must be effective ).
TomTom hasn't replied to me yet.
Michael

 

[Willy875]

Hi

One question: did you buy the GPS in-store or on the TomTom website?
If it was in-store, check with them to see if they can check it or exchange it for another GPS.

 

[Micky84]

Hi

One question: did you buy the GPS in-store or on the TomTom website?
If it was in-store, check with them to see if they can check it or exchange it for another GPS.

Hi,
I bought it on Motostorm.it.
I contacted them to explain the problem but they answered me to fix it with TomTom.

 

[Willy875]

Yes, of course, see with Tomtom it is still them who sold it to you, it is up to them to assume the product warranty.

 

[Andy from Sandy]

I have just checked the one I have here purchased 6 or 7 years ago now and it shows 5.59 volts across the two pins.

Is the TomTom still okay? Does it auto power up if you connect it to a USB port on your computer?

 

[Micky84]

Hello everyone,
Thank you so much for your help.
I finally found what was "wrong": I had a polarity issue with my wiring.
The wiring consists of the following components:
- a Tecmate O-19 cable (DIN to SAE)
- a SEA cable to which I soldered the cable from the TomTom GPS mount.
So, I had 12 volts outputting the GPS mount because my setup was missing an "SAE polarity inverter" between the connections of my two cables (I had asked ChatGPT for advice, but he apparently doesn't know any better than me on the subject ).
After adding this component, I did have 5 volts outputting my GPS mount.
I hope this episode, without forgetting my inexperience, will be useful to others.
Drive carefully!
Michael

 

[raesewell]

So the wires were soldered the wrong way round in the first place? All you had to do was resolder and swap the wires no inverter needed.

 

[Micky84]

The wires weren't soldered "backwards." The red wire is soldered to the red wire, and the black wire is soldered to the black wire
The wires could have been reversed, but then my fuse would have ended up on the ground wire (-), and an electrician friend advised me against doing so.
So I had to put a "polarity inverter" between my 2 SAE connections (at the location circled in red in the photo)

 

[raesewell]

It looks like the loom has been butchered by somebody.
Just because the wire is red doesn't always mean it's positive, checking with a multimeter is always advisable.

Glad you got it sorted and it will serve as information for someone in the future.