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  #1  
Old 11-18-2002, 06:15 PM
turbodiesel300
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80 amp fuse

My glow indicator light has been inconsistent. When it does come on the car starts. If it doesn't light up the engine will crank for 5-10 sec before starting--even if the key is kept in pos. # 2 for at least 20 sec before attempting to start. It's strange that it worked this morning at 30 F. Then after parking the car for a few hours, no glow light. After searching the forum I found that the 80 amp fuse should be checked for any bends. However, I got a nice spark when I took a phillips to the screws. Should I unplug something first?

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  #2  
Old 11-18-2002, 07:00 PM
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Rule: Unplug the negative battery cable before doing any electrical work!
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Old 11-18-2002, 09:25 PM
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TD:

I had this problem and took a pliers to the fuse to flatten it. Worked for awhile and had the same issue develop.
Bought a new fuse for a whopping 50 cents or so but still had intermittant issues.
Now I have to tap the side of the glo relay box when it happens. I think I have a short in there. Bought a $35 replacement box from a junkyard but haven't swapped yet.

Don
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Old 11-19-2002, 03:06 PM
lrg lrg is offline
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I had a similar problem with my 124 in that the glow cycle would work sometimes and not others. I traced it to the 80A fuse. Although it looked OK and appeared to have power on both sides it had corroded or just plain "gone away" in a very thin line right at the edge of the retaining screw. It was an odd thing to happen, it showed no sign of thermal stress (Melting) but it was clear that it was no longer in one piece and the break was hidden at the edge of the screw head (I wonder if the PO may have tightened the screw too much). I replaced the fuse and my problem was fixed. By the way, if you're careful you shouldn't need to remove the battery cable but it is a good idea, a poorly placed screwdriver can fry wires verrrry quickly.
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  #5  
Old 11-21-2002, 08:55 AM
LarryBible
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The bar fuses will sometimes separate at the ends due to vibration. They will be intermittent and appear to be okay. It would be worth the $.50 to replace it.

Good luck,
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  #6  
Old 11-21-2002, 10:56 AM
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Doc Booth on the MBZ.org diesel list swears by replacing this fuse every 5 years or so, regardless of if it looks good or not, AND keeping a spare in the glove box. It's cheap - just replace it!


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