TomTom cradle producing 18v ? Burnt wiring — TomTom Community

TomTom cradle producing 18v ? Burnt wiring

Peter coffeyPeter coffey Posts: 8 [Master Explorer]
edited January 11 in RIDER
Hello im hoping somebody here might be able to help .
I bought a tt 420 yesterday
I took it home and unboxed it
It charded fine using a usb but not in the cradle .
I was thinking just my luck i got a dodgy cradle.
The gps was attached and took off the mount to check for charging on usbs and the likes
When i left the device attached to charging cradle for about 20 seconds the wires from my battery to the tom tom melted
I had to rip the wires off the battery .
When i put 12 v to what was left of the wiring the cradle was producing 18.6 v at the pins.
How i cant understand when my brand new bsttery is 12,8 v
I had it wired direct to the battery which should be fine
I wont be leaving the gps attached when im not riding .
I know people with it wired the same
I took it back to the shop straight away and got a refund
I did order another tom tom 420 but not im having second toughts
What if that happend on the road ?? 100 percent my bike would have caught fire .
I emailed tom tom twice yesterday but iv heard nothimg back .
The shop i bought it was no help at all.
If anybody anybody had any information about this it would be great
Thanks a million

Comments

  • Peter coffeyPeter coffey Posts: 8 [Master Explorer]
    forgot i snapped a couple pics8df388c2-7283-4006-90ae-41ef708fc0cb.jpg6b9d30d3-1b8e-4103-9fc8-c69be3ed5ef7.jpga177d463-f213-44ab-ab58-afc83120ee30.jpg
  • EXPORTMANEXPORTMAN Posts: 634 Superusers
    I have had my Tomtom devices and i have never seen anything like this.
    What I really cant understand is how it could step the voltage up to 18.5v
    Born free, now in debt
  • Ste7iosSte7ios Posts: 725 Superuser
    So high voltage indicates a problematic charging system, a malfunctioning Regulator / Rectifier. Of course TomTom will not be the only problem... You may see even higher voltages and other malfunctions caused by that.

    What’s the output at 5,000 RPM?
  • Peter coffeyPeter coffey Posts: 8 [Master Explorer]
    EXPORTMAN wrote:
    I have had my Tomtom devices and i have never seen anything like this.
    What I really cant understand is how it could step the voltage up to 18.5v
    Its crazy.
    My buddy has the exact same tom tom wired the exact same way
    I asked him to check what he has at the pins.
    Im waiting to hear back from him .
    Il try once more with a tom tom.
  • Peter coffeyPeter coffey Posts: 8 [Master Explorer]
    Ste7ios wrote:
    So high voltage indicates a problematic charging system, a malfunctioning Regulator / Rectifier. Of course TomTom will not be the only problem... You may see even higher voltages and other malfunctions caused by that.

    What’s the output at 5,000 rpm
    13,6 v output
    Brand new battery
    With 12.8 across the termanals standing .
    RR wiring all looks good
    Looks like a prevous owner beefed up the RR wiring on the right hand side of the bike.
    The wiring got hot when i attached it to my 92 fireblade battery aswell
    Again only with the device attaced to the cradle so it wasnt my vfr at fault
    Like i said iv one more 420 ordered and il give it a try
    My mates have tt 420s were all going across europe in may
    And i want the same sat nav to make it handy
    Il be worried about this happening again now tho
    What if its on the roand next time ?.
    An explanation from tom tom would be nice
    Thanks for the answers lads
  • Ste7iosSte7ios Posts: 725 Superuser
    It would be good if you contact with customer support and inform them.
  • Peter coffeyPeter coffey Posts: 8 [Master Explorer]
    Ste7ios wrote:
    It would be good if you contact with customer support and inform them.
    I emailed tom tom twice the day this happened
    With pictures.
    And iv wrote the whole thing out here again
    Even if i was told it was a one in a million thing
    I got a backwards wired cradle
    At least that would be an explanation .
    Im a qualifed mechanic i know this shouldnt happen.
    You can but a ten euro usb port or cheep heated grip and attach them direct to a battery
    And the wiring isnt going to melt .
    So i was thinking a 450 euro gps would be good to go.
    I know a swictched power supply would be better
    But it would be on the same 12v line
    Tom tom is a 12v motorcycle accessory
    It just has me puzzled .
  • YamFazManYamFazMan Posts: 14,968 Superusers
    Hi
    I realise its not the same situation a Step-down Transformer and a Tomtom power supply unit
    But this reminded me when a my Uncle reverse wired a door bell transformer
    Instead of 20 to 1 reduction 240v down to 12v...
    When he Tested/Rang the Door bell, for a split second he achieved a 20 to 1 stepup 240v up to 4800v there was a blinding flash, as the Door bell and the plaster were blown off the wall :scream:

    ATB YFM
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  • nanookotnnanookotn Posts: 3 [Apprentice Traveler]
    The mount should deliver 5.5v at the pins. No idea how it would achieve 18v+. Was your bike running when the mount was connected? If so what was the voltage across your battery?
  • Peter coffeyPeter coffey Posts: 8 [Master Explorer]
    nanookotn wrote:
    The mount should deliver 5.5v at the pins. No idea how it would achieve 18v+. Was your bike running when the mount was connected? If so what was the voltage across your battery?
    Yeah my mate with the same device wired the same way told me today his is 5.5 v at the pins
    So there must be something in the charging mount to step down the voltage.
    Or maybe a brake in the wiring somewhere causing high voltage and burn out.
    This happened with just the ignition on not running the engine
    But i checked both outputs anyway
    12.8 stanging battery voltage
    13.6 with the engine at 5,000 rpm
  • nanookotnnanookotn Posts: 3 [Apprentice Traveler]
    Bit of a puzzler that one. I suggest you patent it before Tomtom realize they've invented a new DC inverter.
  • YamFazManYamFazMan Posts: 14,968 Superusers
    Hi
    My Rider 400 Mount 5.5v

    ATB YFM
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  • Peter coffeyPeter coffey Posts: 8 [Master Explorer]
    YamFazMan wrote:
    Hi
    My Rider 400 Mount 5.5v

    ATB YFM
    Cheers buddy thanks for checking that.
    And thats wired straight to the battery yeah?
    With a bit of luck this new one doesnt miss a beat fir 1000s of miles riding.
  • Peter coffeyPeter coffey Posts: 8 [Master Explorer]
    nanookotn wrote:
    Bit of a puzzler that one. I suggest you patent it before Tomtom realize they've invented a new DC inverter.
    I let tom tom know and i tought i would hear back something about a recall
    Or what ever but no still no word back from them.
    Id be very intrest in how many cases of this this have been
    And whats the cause .
    I might just email them one more time
  • evert123evert123 Posts: 15 [Novice Seeker]
    ......I had it wired direct to the battery which should be fine.....

    Hi Peter,
    It is never wise bolting 12volt wires direct on your battery. Why do you think manufacturers always use fuses to all the electric parts on cars or motobikes? Answer: to avoid possible fires on the vehicle caused by shortcuts in the electrical system. Probably your cradle had a defect, read shortcut, otherwise the wires would not burn this way. Or maybe the isolation of the positive wire from battery to the cradle was damaged and scratched to the frame of your bike?
    For one pound on Aliexpress you could have this fuse in the 12 volt line, at best installed close to the battery: 8fee455b-3a6e-41d6-8f2c-aa846097bf79.jpg

    My thoughts on your burnt TT
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