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heater fan fuse 1985 300 TD

I have and run for the last ten years a 1985 300TD wagon, about five years ago I replaced the heater fan motor. Now the fuse seems to be blowing frequently. Sometimes I can get it to last a few days, then only a half hour or so. I did notice in the fuse panel someone before me, conveniently painted a little red dot by the heater fan fuse. The fuse in there is a blue one and that's what I've been replacing it with.

Thanks,
Jonathan

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82' 300d still not charging

My 82'300d was not charging so I replaced the battery removed the alternator had it tested and it checked fine. The tension nut was missing and the bolt was gound down from rubbing on the pulley so I replaced the bracket, bolt, nut and installed new belts. It started right up and everything seemed to be fine. That was 10 days ago and now it's not charging again. Any suggestions? I'm stumped, any help will be greatly appreciated.

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84 300d switching out odometer

At the time that I bought my '84 300D recently, the spedometer was inoperative (pegged to max) and a few of the other instruments did not work (although the odometer did work), so I sent the whole cluster off for repair and bought a used cluster in good operating condition (for $25!) and installed it. Now the repair service has sent back the old one saying it can't be repaired (they only work on later electronic instruments). Problem is, my car has 124,000 actual miles on it, as indicated by the original odometer; and the replacement cluster came from a donor car with 277,000 miles on it.

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1982 300 TD Conversion

Ok - I installed the kit - have no oil leaks and no audible vac leaks this Sunday. Monday I was running 90% pure diesel with 10 % veg oil. I drove over 75 miles with no problems whatsoever. (As it was such a small proportion of veg oil I did not believe I needed to switch on the heating element.)
This morning the temperature probably dropped to about 45 degrees. I live in the Bay Area and usually it does not get too cold. Again thinking that the high proportion of diesel would again not justify the use of the heating element I started and drove off. My car seemed to have about 40% of the power it normally has and 50 yards later stalled and came to a halt.
I checked all lines and the clear in line filter and saw no debris or leaks.

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79 240d breif power increase?

So I was out running around town and the 240 was its normal slow self when all of a sudden I had a power increase for about ten minutes. Accelerating and driving I could tell a very very noticeable difference. And as fast as the change happened it was gone again. Its never done that before or again. Really though I was maintaining speeds up steep hills that I normally loose 7 mph on! The fuel filters are about 6 months old and I run power service diesel treatment in every tank.

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