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1973 Spider; the daily
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Discussion Starter #1
My 73 alfa romeo spider's center console gauge pods ie. Temp, oil pressure and fuel gauge all dont work. There is no change in any of the gauges with or without power or the car running. Before I go ripping them out causing myself alot of pain is there anything I should be checking first.
 

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Hiya

A couple of things to check...Fuse 6, power to all gauges. Then the earth connection for all gauges is a 'daisy chain' affair, linking them all to an earth point. The fact that ALL gauges are not working is probably one of these 2, rather than all the individual senders having failed.
 

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1978 Spider
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Brush the fuse box contacts too. This is definitely a connection problem somewhere since they are all dead.
 

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1973 Spider; the daily
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Discussion Starter #5
Ice replaced the number 6 fuse and cleaned up the connections. Where would the ground be for the gauges. Also where would be an easy place to check for power. I'm trying to avoid pulling the gauges out. Thanks
 

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As Chris said, the grounds are daisy chained between the gauges (black wires on my Spider). You could run an external ground to one of the gauge gound points but that's probably not the issue. Ignore the red markings on the photo but here is what they look like.

Chuck
 

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Are the grounds just to make the back lighting work? looks like the daisy chain of black wires is grounding the gauge bodies. The pink looks like a hot wire common to all gauges to power the gauge function, but not the lighting? I'm guessing the white with black stripe is the gauge back lighting.

I notice all the "jewel lights" and wiring seems to be missing
 

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1973 Spider; the daily
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Discussion Starter #8
I think my problem lies in the pin knot wire because my charging indicator on the dash doesnt work and that's also powered by that pink hot wire. I'm just unsure where to check for power on that wire.
 

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1973 Spider; the daily
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Discussion Starter #9
So I've currently back tracked the pin wire to the center console lights and I'm getting a tiny amount of voltage on the pink wire. I dont think it would be enough for all the stuff that its powering but I'm no expert. Anyone know how much power I should be seeing on that wire.
 

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1978 Spider
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12 volts? what is this "pin knot" wire? I have a 78 schematic with me at the office. probably the same as your 73 in this respect.
 

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1973 Spider; the daily
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Discussion Starter #11
Sorry stupid auto correct. I ment pink wire. The car was totalled and never fixed right so alot of the wiring is poor quality. Found the pink wire sliced into another wire off fuse 6 using one of those easy splice connectors which I think is giving bad connection. In the process of fixing it. Will keep you all updated.
 

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Access to gauges not too bad - on my RHD car I removed the glove box, and popped out the 2 x vents on top of dash, and this gave pretty good access (I was sorting out the 4 x indicator lights.)
 
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