Hans Efde wrote:I rechecked the reading on the small blue resistor. I can't get a better reading than 75 ohms, measured with different settings on my ohmmeter, via the plug and via the wires. But I don't know what the effect is of the fuel gauge itself. Maybe you can measure this on your own car by taking a reading from the 2 outer pins of the plug (with the ignition in off). If that's an open circuit the resistor must be 75 ohms. If you do get a reading it should be possible to use this to calculate the correct resistance.
I'm fairly certain that the two wires which the blue resistor is connected across will be the two terminals going to either the fuel tank sensor or the water temperature sender (although I could be wrong!), which would mean that you wouldn't be able to measure the resistor's value directly with a meter. However, this also means that the value you measured (75 ohms) will vary depending on the coolant temperature (if it's the water temp sender) or the level of fuel in the tank (if it's the fuel tank sender)!
One thing which would help, is if you could give me your interpretation of what colours the bands are on the two resistors. Despite the clarity of your photos, there's always the chance that the colours might show up differently in "real life". I thought the blue resistor looks like "red, violet, black, black, red" (the gap between the black and adjacent red is wider than the other gaps, which I believe means that wider gap separates the resistor values (first 4 of 5 bands, or first 3 of 4 bands) from the tolerance percentage (the final band).
By the same token, the buff resistor I interpreted as "brown, grey, black, gold".
Would you agree that those are the colours you see?
Many thanks (and a special award if you've managed to make sense of this post!).
