February 2, 2012 at 9:54 am #233955RoyalParticipant
Went for a ride the other morning, a little foggy so I turned on my defroster. Even tried out my fog lights. Everything was fine, she was running good. Enjoyable ride: then I noticed that my oil pressure was about 12# below normal. Pulled over and did some head scratching. Defrost motor is a little loud, so I turned it off to help me think better. Oil pressure immediately went up to normal. Then I cycled all switches and found that I “lose” about 8# pressure with the dash light on. (Also lose about 3 gallons of gas.) I rarely listen to the radio. Put on some good Texas Swing and my oil pressure kept perfect time with the music. I lose about 6# pressure with each kick of the bass drum.
A little rewiring, running a couple of new “hot” wires and now I have to tap my foot to keep time with the music.
I pass this on in case any of you are wondering about low oil pressure. Your guage actually measures voltage which is dependent on oil pressure. But it is also dependent on the voltage supplied to the meter. My fuel guage, oil pressure, radio, interior light, windshield wipers and defroster motor all were drawing on the same small (18 guage) wire. Don’t know who originally wired MiGi but she’s good now.February 2, 2012 at 4:58 pm #248917edward ericsonParticipant
Well played, sir.February 2, 2012 at 5:54 pm #248918MikeParticipant
Hey this make sense Roy. The warm oil runs through a defroster coil where a fan blows air over the coil to defrost the glass, but with all the oil in the defroster coil it cause oil pressure to drop in the engine! The only thing that puzzles me is the 3 gallons of gas it takes to run the defroster motor. Terrible milage indeed.
Just kidding with you of course. Glad you fixed the problem.February 2, 2012 at 6:03 pm #248919Larry MurphyParticipant
Mike, Best laugh I’ve had all day!!!!February 2, 2012 at 6:54 pm #248920john barryParticipant
Roy -its the same way with my MG TD London Roadster .. Thanks for clearing it up.
johnFebruary 2, 2012 at 7:56 pm #248921RoyalParticipant
Mike, You’re a funny guy!February 3, 2012 at 7:07 am #248922Scott A ChynowethParticipant
This is why I never put any stock/faith/or trust in an electric gauge,other than volt/ampmeter.
I know its difficult if not impossible to find a 20 foot capilairy tube for an oil gauge.So if a person is dependant on an electric gauge spend a little more and get a good quality gauge.February 3, 2012 at 8:32 am #248923edward ericsonParticipant
Good advice, Scott, but this gauge was just wired wrong. Ever a good gauge will read bad if it’s wired wrong.
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