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1983 300D//Fuse Box
Good day everyone-
Been reading through the the threads and I think I have my course of action planned out, but I'd like some confirmation that I'm understanding what I'm reading. I bought this car a couple months ago as my next project. All fuses were changed out to MB ceramic. Problem: Fuse #8 had melted away the contact points in the fuse box. Solution: Thinking I'll install the MB external fuse mod for the blower. It seems like I can unfasten the fuse box and tilt it fwd to access the back and do the connections. Is this actually how it will happen? Also, the A/C push-button controls do not stay in when pushed. With #8 fuse out, is this why the defrost button will not catch and stay down. My first thought was I needed to find a new push button assembly, but after fixing the fuse box will this fix that problem? Any comments are greatly appreciated. Thanks, Lance-
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1985 300SD, 300k.....gifted to Daughter 1987 300SDL, 320k.....gifted to Son 1978 300CD, 230k....Sold 1983 300D, 175k....Dead |
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Quote:
Happy Motoring, Mark
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DrDKW |
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With ANY electrical issue ... the fuses and the box are the 1st places to go.
Id suggest repairing the box and making sure ALL your fuses are good. A full set with extras is bout $10 on fleabay. Make sure the right value fuse is used too. Should have a paper roadmap on the inside of your fuse box cover. Once that is done, make the aux fan mod and continue
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1985 300D 198K sold 1982 300D 202K 1989 300E 125K 1992 940T "If you dont have time to do it safely, you dont have time to do it" "The democracy will cease to exist when you take away from those who are willing to work and give to those who would not." |
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I'm surprised the contact points melted away,seems that would take much heat.
Anyway, the fuse blew for a reason. The blower motor may have very short brushes, which will draw too much power and blow the fuse. Try and isolate the issue, otherwise you'll keep blowing fuses.
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83 SD 84 CD |
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It would be a lot of work to switch all the wires to another fusebox AND not get any of them mixed up. Switching the fan wiring to a vacant spot on the existing fusebox is the easiest fix and allows for simple fuse replacement. Wiring in an inline fuse-holder to the back of the box means you'll probably need to go under the dash to change the fuse. Otherwise, any issues with the fan itself still need to be addressed. Note: Some aftermarket fuses have plastic bodies that melt, or have aluminum strips which corrode at the copper fusebox contact points, causing or contributing to this problem. Happy Motoring, Mark
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DrDKW Last edited by Mark DiSilvestro; 02-06-2015 at 08:28 AM. |
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Short brushes does not draw more power and blow fuses. Bad bearings, dry bearings (extra drag), blower cage rubbing (extra drag) will.
If there is poor contact between the fuse and fuse holder, a hot spot is created from the blower trying to draw 18 amps through it and that can get hot enough to melt where it attaches to the fuse box.
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85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
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I see.
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83 SD 84 CD |
#8
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short brushes
Short brushes do not draw more current than longer brushes but a motor with short brushes that has not been cleaned or blown out will draw more current due to carbon brush dust accumulation. Sometimes excessive current draw is simply due to carbon accumulation in commutator slots. The dust is easily cleaned out once the commutator is accessed.
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1980 240D, 145,000 miles 1983 300SD, 75,000 miles |
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The AC Push buttons are unrelated to Fuse #8.
With the Ignition off the Buttons should stay pushed in. You have two separate problems. Your PBU (push button unit) is faulty, along with the fuse problem. Charlie
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there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works |
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