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Discussion Starter #1
Hi all. First post here. I have a '55 Vivaro 1.9.
The 4-pin plug has only 2 wires in it but I think this is normal.
I'm trying to repair the connections.
Can anyone tell me what each wire does please?
 

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Violet to 2 (signal earth),Brown to 3 (signal),the others are empty

Untitled picture6.png
 

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Discussion Starter #3
Thanks. You know how these are difficult to get to. I'm getting a number of issues due to loose connections and broken wires. I know it needs a complete overhaul.

Atm, I only have #2 connected and the fan runs low speed constantly but with no reading on the dash.

When I connect #3 also, the fan stops. But, while I'm fiddling with it, the fan occasionally kicks into double speed (regardless of temperature), but only for a second or two.

Sometimes I get the fan to run constant low speed with both terminals connected, and with an apparently accurate reading on the dash.
 
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