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@winterneuro avatar
UTC

Enthusiast
2014 Vespa 300 GTS Super
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@winterneuro avatar
2014 Vespa 300 GTS Super
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UTC quote
Howdy all. I purchased the SIP Speedo to replace my old damaged speedo. I learned that something on the old speedo got burned out (literally!). I'm now having issues with the NEW speedo, and I think it's because of the connector (see image). This connector for the 4 pin PCB is in bad shape. I've already tried electrical cleaner twice.

I'm thinking this will be a tough part to replace. The PCB in the wiring harness has a hole in it (see other image).

Can I: Cut off the connector. solder the bare wires directly onto the PCB (feeding the wire through the hole in the middle of the PCB). Cover with an incredibly generous amount of electrical tape.

thank you!

EDIT: It's possible that connector is easy to replace and I don't know what it's called?
damaged connector?
damaged connector?
wiring harness
wiring harness
@wbdvt avatar
UTC

Molto Verboso
'16 Sprint S 150, 2 x '06 GTS 250, '12 GTS 300, '74 Vespa 150 Super
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Molto Verboso
@wbdvt avatar
'16 Sprint S 150, 2 x '06 GTS 250, '12 GTS 300, '74 Vespa 150 Super
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UTC quote
There does appear to be corrosion on the contacts and on the pin connectors themselves. Back in the days of yore with old electromechanical relays, we used to have to burnish the relay contacts. Perhaps, try cleaning the contacts with an emery board first.

You can solder, etc. but makes future repairs harder.
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UTC quote
wbdvt wrote:
There does appear to be corrosion on the contacts and on the pin connectors themselves. Back in the days of yore with old electromechanical relays, we used to have to burnish the relay contacts. Perhaps, try cleaning the contacts with an emery board first.
I'm not sure I have one thin enough to get in the connector. I mean it's a tight fit!
Quote:
You can solder, etc. but makes future repairs harder.
What do you mean by this? I think you're telling me my idea is solid - I can solder the wires to the PCB. But, how would it make future repairs harder? If the part were to fail again, just desolder and replace, right?

I'm kinda in the "I know enough to be dangerous" camp, so I'm really just trying to (a) understand; and (b) get my scoot back on the road in the most efficient way possible (cost and time).

EDIT: Do you know if something like this would be better (please see pic)?

Thank you!
[/img]
terminal connector?
terminal connector?
@jimc avatar
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The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
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@jimc avatar
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
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UTC quote
Something like that would be fine. I'd be using another connector (or connectors) rather than solder directly onto the PCB. Even soldering some wires onto the PCB and then using a "chocolate block" connector would be OK.

https://www.amazon.com/GUBCUB-Terminal-Position-Electrical-Connector/dp/B08VND5XDN
Forum member supplied image with no explanatory text
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UTC

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2014 Vespa 300 GTS Super
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OK! Last question - When I take your advice and solder wires to the PCB first, do they have to go through the hole in the center, or can they lay flat?

thank you very much!
@jimc avatar
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UTC quote
Winterneuro wrote:
OK! Last question - When I take your advice and solder wires to the PCB first, do they have to go through the hole in the center, or can they lay flat?

thank you very much!
Either. Just laying flat is easiest.
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UTC quote
OK! I have some solid core wire that I'm going to use and see if I can fix this.
Thank you very much!
@jimc avatar
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The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
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@jimc avatar
The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
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UTC quote
Winterneuro wrote:
OK! I have some solid core wire that I'm going to use and see if I can fix this.
Thank you very much!
Please don't use solid core on or in any vehicle, there's always too much vibration. Any auto-parts store or better marine store will have plenty of suitable stranded 18 gauge.
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2014 Vespa 300 GTS Super
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Oh, ok then!
@jimc avatar
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@jimc avatar
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UTC quote
Don't forget the heat-shrink if you join wires together!
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2014 Vespa 300 GTS Super
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2014 Vespa 300 GTS Super
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UTC quote
I wound up picking up insulated connectors that can be crimped from the auto section of the store and I'm going to use that to connect the two wires together.
UTC

Veni, Vidi, Posti
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Location: Tega Cay, SC
 
Veni, Vidi, Posti
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UTC quote
Crimping will work, just test each connection after by giving the wires a bit of a pull.
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@winterneuro avatar
UTC

Enthusiast
2014 Vespa 300 GTS Super
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UTC quote
Harness finished. Tomorrow we take care of the connector side, and then hope that the weird electrical behavior the new speedo was exhibiting goes away.

EDIT: I think it's fixed! I couldn't wait, so I went out with my headlamp and I hooked everything up tonight, and I think everything is working as it should. I'll know tomorrow in daylight.
PCB wired and ready to be connected to wires in the scoot in the AM (EST US)
PCB wired and ready to be connected to wires in the scoot in the AM (EST US)
OP
@winterneuro avatar
UTC

Enthusiast
2014 Vespa 300 GTS Super
Joined: UTC
Posts: 69
Location: Buckhannon, WV
 
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Location: Buckhannon, WV
UTC quote
Thank you wbdvt, jimc, and Tierney! I'm back on the road with a working Speedo!
@wbdvt avatar
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Molto Verboso
'16 Sprint S 150, 2 x '06 GTS 250, '12 GTS 300, '74 Vespa 150 Super
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Molto Verboso
@wbdvt avatar
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UTC quote
Well done and thanks for letting everyone know you were successful in the repairs!
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