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#1
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Odd tach question?
I have been playing with the tach on my 83 300TD. It has never worked since I got the car. Once while messing around I happen to hit the AC and suddenly the tach was jumping all over the place... this only lasted a day or so. I was under the impression from that that I was dealing with a bad ground situation being the dash was replaced by PO, there is no telling what might have gone missed etc.
Today I replaced the pickup, using my known good one from the new engine I have sitting here, I also popped on the known good tack amp I have. I have also replaced the tach itself with one I got from Vstech. Still nothing. Was working on something else and noticed that Fuse #3 was out. Put it in and suddenly the tach works? What's fuse #3 have to do with the tach? Or, is this just a coincidence... Tachs not smooth, seems to hang up a little, might be the old tack, going to toss the original one on to test, but it seems to be reading the RPMS correctly. |
#2
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Tach amp and tach needs power to operate. Maybe fuse 3 supplies power to it?
Jumpy tach can be pickup gap too wide (try adjusting it to a narrow gap), or a flaky tach amp.
__________________
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 |
#3
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Not jumpy, more like the needles on too tight and causing friction.
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#4
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Ok, from further reading....
#3 feeds the amplified signal to the tacho That would explain that... |
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