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  #1  
Old 07-21-2000, 07:25 PM
arochard
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Nobody seems to be able to help me locate the function of a fuse box in my 1976 230.

There are two small fuse boxes holding 2 fuses each, located on the driver's side between the battery and the main fuse box. I'm having a problem with the front of the two, as the furthest left fuse keeps blowing.

If anyone has the electrical info on this, please let me know.

Thanks,

AARON ROCHARD

1976 230.4
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  #2  
Old 07-22-2000, 09:37 AM
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Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
One of the little fuse boxes is for a/c compressor & aux fans. Will have to look at work for wiring on this old of car as BRAIN doesn't remember.
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  #3  
Old 07-22-2000, 02:01 PM
arochard
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Super, I just wanted to confirm my suspicions. I've been hearing a loud screeching noise that starts around when the blower fan should be kicking in. The front fuse box (as I've mentioned)keeps blowing, so I feel it's fan related.

Is there any common thing in these cars that tends to go first ?

Thanks,

AARON
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  #4  
Old 08-01-2000, 12:44 PM
arochard
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Yes, just replaced the little fuse box and that particular fuse blew again. (a 25W fuse) so it seems like something pretty serious. Can anyone help me ???

AARON 1976 230.4
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  #5  
Old 08-01-2000, 05:48 PM
rpa
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quote:
Originally posted by arochard:
Yes, just replaced the little fuse box and that particular fuse blew againAARON 1976 230.4


Find the thermostat for the fans, disconnect
and put a wire jumpering the loom [i.e
as if the thermostat was on]. Disconnect
the fans. [at fan end of loom]
Turn on, if fuse blows, its prob a loom fault. If not, turn off, reconnect fan,
turn on - if fuse blows, fan motor is
ceasing [if 2 fans, do it one by one]

Careful fans dont chop your fingers off, be
aware that fan cct may be powered even with
engine off on some cars [so fans can
run on after engine off [vw's do this]]

Cheers
R
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  #6  
Old 08-01-2000, 06:56 PM
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Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
ON this car these aux fuse boxes can be for any optional equiptment. ie; a/c, sliding roof, heated seats, aux fan, radio, & more. What color wiring goes to both sides of the fuse that keeps blowing?? The highest reting for any of these fuses on US cars is 16A, not 25A.
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  #7  
Old 08-02-2000, 11:56 AM
arochard
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Actually, I believe the wire going to the fuse that keeps blowing is black. The other one that doesn't blow is red.

Hope this helps.

AARON

1976 230.4
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  #8  
Old 08-02-2000, 01:57 PM
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Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
The only listed consumer for the 2.5mm black wire is the electric sunroof! It may share fuse with heated rear window, in that case it would be 25A.
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  #9  
Old 08-02-2000, 03:15 PM
arochard
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Possibly that could be the other aux fuse box contents, because I havent had any problems with the sliding roof, although the rear defrost hasn't worked at all, since I bought the car, possibly the relay, (but that's another issue) This fuse is in the aux fusebox closest to the battery and furthest away (of the two) from the main fuse box.

Thanks,

AARON 1976 230.4
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  #10  
Old 08-02-2000, 05:43 PM
arochard
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I was just speaking to someone on another Mercedes info group and they suggested that it could be something as simple as changing my belts. Could the belts potentially cause such a problem ? It has been since October.

Thanks again,

AARON ROCHARD
1976 230.4
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