The 80 amp fuse is intended for running 6 glow plugs. It is the WRONG
fuse. The correct fuse looks the same but will be 50 amp. This was in
my post yesterday. Another post yesterday told you the fuse was in the
top of the relay, under the relay cover, and exactly how to take the
cover off.
Since the fuse blew, you could still have a grounded GP. If so, the
next fuse will blow also. Each fuse will blow until you locate and
correct the problem. It is also possible that one of the wires to the
GP is shorted to the block. This is a common problem in the OM60x
engines, and less common on the iron head engines like yours. I'd guess
you have a shorted out GP. The test procedure is in my post from last
night. Without a meter that has a range of 0-20 or 0-50 ohms or a finer
scale, or a digital that can read in 10th of an ohm, it is very
difficult to discriminate between a shorted GP and a good GP.
At any rate, before you stick in another fuse, test the ohm readings at
GP wire harness that plugs into the GP relay. Read the ohms between
each of the 4 sockets with liners in them and a good ground. A good GP
will read 1.4 ohms + or - 0.5 ohm. A grounded plug will read 0 or the
same reading you get when you hold the two meter probes together.
(depending on the meter, this may not be 0)
John Ingram via Mercedes <mailto:mercedes@okiebenz.com>
October 3, 2016 at 6:12 PM
Hello Everyone,
I went out to the car and searched for the fuse and finally found it
inside the cover on top of the relay. I hope it is the right fuse
because it was blown and came out in two pieces. It is just a steel
band and looks like the fuses in the on-line websites. The only
lettering I can find looks to say 80A and is followed by a P with a
circle around it. Is this possible?
This car is a very late 83 240D, one of the last ones sent. Over the
years I have had to use the VIN number in order to get the right part.
I think MBZ was using the parts they had left when they made this car.
Some parts were clearly from earlier years, others may have been last
minute changes.
I think I’ll look for a fuse first (80A?), It might fix it.
Thank you all again for your help!
John Ingram
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