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Mrfun2fly
Samba Member
Joined: November 29, 2015
Posts: 548
Location: New Mexico
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 Posted: Fri May 19, 2017 10:08 pm Post subject: Help wiring my Speedo |
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1970 Ghia:
Here's the scoop and I'll try not to be to wordy. I recently wired my ghia w/a new wiring harness and having mental/tech difficulties wiring the speedo.
Look at the wiring diagram, the ground from the fuel gauge, goes to the speedo then to the clock.
Looking at the original wiring diagram, there's a black wire that appears to connect from the fuse box to one of the lights (K3).
1.Is there two wires coming off K3? the black wire that goes to the fuse box and the blue/green wire connect to K3?
2.Does the ground wire that comes off the fuel gauge to the speedo connect to the clip I circled in yellow with an yellow arrow pointing to it??
3. how does the upper lights get grounded, letters "A-F" what are those connectors I circled in blue with the blue arrow?
Thanks! |
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sputnick60
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Joined: July 22, 2007
Posts: 3916
Location: In Molinya Orbit
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jason_hamilton
Samba Member
Joined: February 07, 2003
Posts: 1118
Location: Abbotsford, BC
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| Posted: Sat May 20, 2017 7:37 am Post subject: Re: Help wiring my Speedo |
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| Mrfun2fly wrote: |
| 3. how does the upper lights get grounded, letters "A-F" what are those connectors I circled in blue with the blue arrow? |
Those twin tabs circled in blue are to connect ground wires for all the upper bulbs (what you call A-F). They get power only when switched on.
For the lower three bulbs, the best way to think about them is that their circuits run opposite to everything else. They always have power, provided by the tab at the end. That's why they are electrically isolated from the rest of the gauge. In the case of the oil and battery lights, they turn off when the engine is running because their sensors deprive them of a ground, disconnecting the circuit.
_________________
Jason Hamilton
1969 Karmann Ghia coupe
@MiddleAgedHoon |
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kiwighia68
Samba Member
Joined: October 20, 2013
Posts: 2876
Location: Auckland, New Zealand
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| Posted: Sat May 20, 2017 10:26 am Post subject: Re: Help wiring my Speedo |
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| jason_hamilton wrote: |
| Mrfun2fly wrote: |
| 3. how does the upper lights get grounded, letters "A-F" what are those connectors I circled in blue with the blue arrow? |
Those twin tabs circled in blue are to connect ground wires for all the upper bulbs (what you call A-F). They get power only when switched on.
For the lower three bulbs, the best way to think about them is that their circuits run opposite to everything else. They always have power, provided by the tab at the end. That's why they are electrically isolated from the rest of the gauge. In the case of the oil and battery lights, they turn off when the engine is running because their sensors deprive them of a ground, disconnecting the circuit. |
Two years after wiring my speedo without understanding what the heck's going on, an explanation that makes sense.Thanks Jason.
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Festina lente - hasten slowly
1968 Ghia named Emiko
Resto completed Dec 2015 |
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