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#1
06-26-2006, 01:28 AM
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Compressor clutch not getting enough current
I have 12V at the leads going to the compressor, but it will only engage if I jump it straight to the battery. I think the clutch is not getting enough current.
Common problem?
__________________
1976 BMW 2002- 100k 1995 BMW 325i 175k 1984 Mercedes Benz 300D Turbo Diesel- 270,000 mi 1981 Mercedes Benz 240D- Estimated 300,000+ mi Returned to the earth 
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#2
06-26-2006, 01:31 AM
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did you check for voltage at the plug? sounds like maybe your low on freon and the low pressure switch isnt letting the clutch engage.
__________________
have no worries.....President Obama swears "If you like your gun, you can keep it 
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#3
06-26-2006, 02:21 AM
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I'm checking at the black female plug, which plugs into the two male prongs on the compressor. Somewhere over 12 volts.
__________________
1976 BMW 2002- 100k 1995 BMW 325i 175k 1984 Mercedes Benz 300D Turbo Diesel- 270,000 mi 1981 Mercedes Benz 240D- Estimated 300,000+ mi Returned to the earth
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#4
06-26-2006, 07:40 AM
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correct statement
you might borrow an amp meter and see how much current your drawing straight from the battery... if its more than say 15 or 20 amps then the problem is in the compressor...
an amp meter looks like a C clamp and clamps around the outside of the wire. and reads the magnetic field.
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#5
06-26-2006, 09:03 AM
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Quote:
You can bet that he doesn't have a problem with "current". It's either a switch or the CCU. BTW, the clamp on ammeters don't work on DC..........no magnetic field.....  The clutch uses about 3 amps or so.
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#7
06-26-2006, 09:13 AM
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and make sure it's not just a lousy ground. measure the coil resistance on the compressor, should be about 4 ohms. if it's close, it should draw 3 or 4 amps when given 12VDC.
Sort of off topic, Brian is right about the clamp on/AC only, however, I have a el cheapo 12VDC current tester that measures current by being held up against the conducting wire. Not Swiss made, but handy for checking alternator and starter lines.
__________________
'82 300SD - 361K mi - "Blue" "Good judgement comes from experience. Experience comes from bad judgement." listen, look, .........and duck.
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