Quote:
Originally Posted by 97 SL320
Using a volt meter on an electronic circuit board fed by a well regulated power supply will work. However , a car has a unregulated supply and long wire runs. This makes for " yep, the voltage is slightly low but is it due to a fault or normal resistance? " .
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My knowledge is only from actual experience. I have no theory or other electronics knowledge.
I mean if I was checking + wire to the Window and I had 12 volts instead of 12.50 volts due to wire resistance I would deem that enough voltage ao allow the window to work.
However, I recently had a problem on my Chevy Van Window. In this case there was some but not all of the wire strands broken (about 1/3 of the strands broken on 2 different wires) and that apparently caused enough resistance in the Window Switch and I eventually had smoke coming out of the Switch. The Window only worked intermittently and finally not at all.
Since the broken strands were near the connectors I ran a bead of Solder on each wire to the connector allowing a good circuit and an New Switch and that fixed it.
In that case although it was trouble shot without an Meter or Test Light I would have been showing good voltage and it is likely the Test Light would have also worked fine as the Test Light would not need a lot of current.