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  #1  
Old 12-27-2009, 03:48 PM
Ian White's Avatar
machinemanjr
 
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w126 Blower Fan Current Load??

I have been havign trouble with the blower motor function on my CCU. I have decided to wire in a relay on a switch to turn on and off the blower motor. I need to know the fan's amperage draw so I can get a large enough relay and fuse socket(s)

Thanks...

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1995 E300 Diesel w124 OM606
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  #2  
Old 12-27-2009, 11:14 PM
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I'm surprised that nobody in the know has responded. I've read the fan current draw on this forum, but cannot recall exactly. If I remember this part correctly, the fuse for this circuit is a 20 amp and it controls the fan and the AC compressor (and maybe some other minor loads). Given that fact, I would think that any portion of the fan circuit should be safe at a 20 amp protection level, even if the compressor is no longer on the same circuit. If you install a modern fuse socket and insert a 20 fuse, and then later decide that you feel better with a smaller fuse, just change the fuse.
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  #3  
Old 12-27-2009, 11:43 PM
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Ian,

Just curious, why not replace the motor brushes, a little work and about $30.
Or even replace the whole motor with a new one (about $90).

I replaced the motor with a new one on my 83 300SD.
My rationale was that I intend to drive the car until it dies,
which is most likely to be after I do.

This way my car is stock and works as it should.
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  #4  
Old 12-28-2009, 12:33 AM
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machinemanjr
 
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Quote:
Originally Posted by rhodes2010 View Post
Ian,

Just curious, why not replace the motor brushes, a little work and about $30.
Or even replace the whole motor with a new one (about $90).

I replaced the motor with a new one on my 83 300SD.
My rationale was that I intend to drive the car until it dies,
which is most likely to be after I do.

This way my car is stock and works as it should.
The problem lies in the CCU and not the fan unit. I have cobbled together jumper wires to test the fan, and it works just fine. I do not care about a fully functioning CCU as much as defrost!!
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1995 E300 Diesel w124 OM606
2007 GMC Sierra Classic 1500 4x4 5.3L

2001 BMW 740i E38 M62 (past)
1981 300SD w126 OM617 (past)
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  #5  
Old 12-29-2009, 01:32 PM
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The stock fuse is 25 amps. If your motor is good, 12 ga wire and 25A fuse should do it.
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  #6  
Old 12-29-2009, 02:48 PM
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Quote:
Originally Posted by Ian White View Post
I have been havign trouble with the blower motor function on my CCU. I have decided to wire in a relay on a switch to turn on and off the blower motor. I need to know the fan's amperage draw so I can get a large enough relay and fuse socket(s)

Thanks...
Well, if you are going to use a relay, you'd want to get one that is capable of at least 30A (25A fused circuit for fan as others have stated) on the secondary. Then you'll need to find out what the activation current is on the primary side. Take always hot 12V and put it in series with the switch and a decent resistor that will allow proper activation current to the primary side but also protect from over amperage - maybe put a fuse in there as well that is within tolerance of primary over-amperage. Resistor will need to be able to handle wattage.

As others have pretty much said, it is probably easier to just use a switch.
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  #7  
Old 12-30-2009, 04:08 AM
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machinemanjr
 
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I have used 10 gauge wire with a 30 amp toggle switch. It still gets hot in use. I think a relay would be better........

Ian

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Ian White

1995 E300 Diesel w124 OM606
2007 GMC Sierra Classic 1500 4x4 5.3L

2001 BMW 740i E38 M62 (past)
1981 300SD w126 OM617 (past)
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