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Old 01-04-2002, 11:15 AM
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Join Date: Jun 2000
Location: Near Williamsburg, Virginia
Posts: 359
Blows 16 A blower fuse on '82 300 D

My daughter's '82 300 D (123) keeps blowing the 16 amp heater blower fuse. I notice it blows when in defrost mode which places the blower in its fastest position.

I see in a parts book that there is a 30 amp repair kit for this for about $30. Is this repair kit a 30 amp fuse holder with push-on connecters that attach to the terminals in the fusebox where the 16 amp fuse is? If so, I imagine I could pick up any 30 amp holder and fuse, solder two connectors to it, and plug it on. Is this correct?
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Old 01-04-2002, 02:33 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
ALL W123 chassis cars with A/C/C require a 25A blower fuse as the blower is rated at 22 amp max draw. MB never up-dated the fuse chart for the USA to reflect this correct current draw!!
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Old 01-04-2002, 03:46 PM
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Join Date: Jun 2000
Location: Near Williamsburg, Virginia
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Thanks. I'll put a 25 amp fuse in it and see if that takes care of the problem. I hold off installing a 30 amp fuse & holder.

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Old 01-04-2002, 04:34 PM
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Sorry, but I can't help but chime in with my old fuse story.

When I was 14, yes by taking drivers education, you could get your drivers license at 14 in Texas in 1963, I had a '48 Chevy. It cost $12.50 from the junkyard, and about another $100 and bunches of sweat to get it running. It had a glass, 30Amp fuse on the headlight circuit, no circuit breakers on the lights in those days. This fuse was for BOTH headlights, unlike an MB.

One pitch dark night, I was rolling down a country road, luckily a straight one, when the headlights died. The girl next to me, whose shoulder my arm was around, screamed in my ear from fright. This is why I have slightly impaired hearing in my right ear today. I put a gum wrapper around the fuse to get home.

Under less dangerous circumstances, it blew the fuse again. At that point, I decided I would smoke out the problem by putting a piece of copper tubing in place of the fuse. I drove the car a couple more years with no problem and forgot about the tubing. When I sold the car for $40, I forgot to tell the new owner about it. I wonder if he ever got a bad right ear because of this, or even worse.

Sorry, I couldn't pass it up. Sometimes a circuit is just drawing a little more current than the fuse can handle. It sounds like that's what you're dealing with.

Have a great day,
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Old 01-04-2002, 06:03 PM
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Join Date: Jun 2000
Location: Near Williamsburg, Virginia
Posts: 359

Thanks for the great story! I loved it.

Reminds me a bit of the three land rover 110 diesels that I drove over a period of three years. The fuses were always blowing (electricals provided by the Prince of Darkness - Lucas) and instead of continuing to buy new fuses I made my own out of strands of copper wire. I forget, maybe we estimated that one copper strand would handle about 8 amps and added strands to meet the peak demand.

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