Baffled x2

Anything related to Vespas... ask tech questions, post helpful info, or just read and learn.
tony172
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Main scooter: vespa t5
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Thu Jun 20, 2019 3:52 pm

I've 2 vespa px discs with me (one mine, one a friend's) with exactly the same fault, and for the life of me I can't suss it out.
Indicator warning light, low fuel light and fuel gauge are not responding at all.
Both were working previously and have had nothing changed, and all of a sudden half the instrument panel is bust!
Anyone point me in the right direction?
All other electrical bits work fine still

gaz_powell
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Location: hartlepool
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Thu Jun 20, 2019 6:08 pm

Break in the printed cuircuits of the wiring on speedo

tony172
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Main scooter: vespa t5
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Thu Jun 20, 2019 7:22 pm

Hi thanks for the reply,
Is this something you have had before?
I think you're most likely right but I don't want to spend a hundred squid if I don't have to.
Thanks again
Tony :D I

gaz_powell
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Thu Jun 20, 2019 9:38 pm

Yes mate .....unfortunately it was a new speedo required - I managed to pick a good 2nd hand one up

tony172
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Main scooter: vespa t5
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Fri Jun 21, 2019 12:39 pm

Nice one mate, thanks for that.
At least it saves me endlessly chasing wiring around both scoots trying to figure it out

firekdp
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Fri Jun 21, 2019 4:00 pm

All 3 of those circuits are powered from the grey wire so check the condition of the contacts at the speedo connector.

gaz_powell
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Fri Jun 21, 2019 9:34 pm

/\ that's a good call !

Mine was the printed circuit it had broken and was visible shot!

Good Luck

tony172
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Posts: 108
Joined: Sun Jan 13, 2013 10:50 pm
Main scooter: vespa t5
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Sat Jun 22, 2019 7:23 am

Funny enough i had the horncase off my mates one and have a stray double grey wire with a female spade connector there. Couldn't find where it came from, it's just hanging around in thin air. One wire comes from the buzzer (not connected) and one goes down into the loom, but where it plugs in i cannot suss.
There's also a black one hanging under the horncase
They're the only 2 without a home, and plugging them together kills all electrics on the bike.
Any ideas?

firekdp
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Sat Jun 22, 2019 9:11 am

Grey is normally AC power and black earth, so plugging them together will short all electrics out.

firekdp
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Sat Jun 22, 2019 10:17 am

Those extra wires are normally for the PRD relay, which has probably been removed.

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