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Posted by Will (in IL) [98.215.26.138] on Thursday, January 19, 2012 at 15:04:28 :
Well,
I had installed the wipers and now am installing the wiring. I mounted the 50W 4 ohm resistors, and, well the wipers were real slow.
I measured the voltage, and it was only 4 volts at the wiper, while I had 13.5 volts at the power supply.
Measured the voltage across the resistor and as it should be the other 9.5 volts was there. Oh and yes the resistor sure got got quickly.
Did a little math using Ohms law, and tried to measure the current. Discovered my previous current measurements were bogus, as my current meter is only good for AC voltage.
Based on the math, it looks like the actual wiper motor resistance while working was only 1.68 ohms. If I run the motor on 12 volts, the amperage should be 8 amps at 13.5 volts.
I'm still thinking that the motors were re-built with 12 volt components and no label added to indicate the change, but the seller didn't believe so, but they were re-built and bought back in 2004.
So now I'm thinking I should give them a try at the full voltage and see how they work. I'll only install a 10 amp fuse per motor so if they are indeed 6 volt units they should blow the fuse quickly.
Thoughts?
Will
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