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  #1  
Old 07-25-1999, 11:46 PM
kjcalhoun
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Posts: n/a

My 1985 300CD's battery died. After

several unsuccesful attempt's to recharge,

I had it load tested, and I ended up

replacing the battery. Ever since then,

the tachometer quit working and the a/c

compressor no longer comes on. Is this

just a coincidence, or are they related

somehow?

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  #2  
Old 07-26-1999, 08:43 PM
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Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Related! Your car has an overload protection relay that protects the EGR computer from excessive voltage. The relay has a 10A fuse that blows when the voltage is to high or has incorrect polarity. The relay is mounted next to the right A/C outlet vent beside the glovebox.
  #3  
Old 07-26-1999, 10:51 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
To add to DOC. You have to take out the inner panel of the glove box. The small rivets have to come out then just pull.

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  #4  
Old 07-27-1999, 09:56 AM
WDurrance
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The 1985 model also has an electronic EGR control unit.The tach signal runs through it.There is a wire at the positive battery terminal that supplies power to the EGR control box. Be sure that wire is tight...I've seen them loosened during a battery swap and not retightened.
Randy D.
  #5  
Old 07-28-1999, 11:05 PM
kjcalhoun
Guest
 
Posts: n/a

You guys are awesome!!! It took all of

15 minutes to replace the blown fuse on

my relay and restore my tach and A/C.

The A/C is particularly satisfying as

the temperature has been 100 degrees for

the past several days. Thanks again.
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