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#1
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tach question. please assist
yes yes yet another tachometer post. sorry.
anyways the vehicle in question is an 85 w123 300d California model. so its a 3 prong/crank trigger tach specific only to that year and possibly 1984. so far ive bought a new engine computer, and gauge cluster, also grabbed a new pickup from a w124 om603 at the junkyard. still the thing does not work. i realize the easiest method would be an oscilloscope and to check the signal directly, but im not an electrical engineer nor do i know what exactly to look for aaand i aint got one of them electrical gizmo boxes (yet ). sooo before i do that... what part am i forgetting to throw at this problem. the new computer fixed the temp gauge but the tach still does not work. back story behind the tach failure, i fried it by hooking up a battery wrong in the dark with the engine running. alternator is fine the old computer and tach were not. this car has an om 603/5speed swapped in place of the original 617/slushbox. when i first completed the swap the tach functioned normally. only after me being stupid did it fail. so if that gives any insight to my problem please let me know lol. |
#2
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Quote:
EDIT: I am curious how you put a 603 trans behind a 617?
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All Diesel Fleet 1985 R107 300SLD TURBODIESEL 2005 E320 CDI (daily) LOTS of parts for sale! EGR block kit http://www.peachparts.com/shopforum/diesel-discussion/355250-sale-egr-delete-block-off-plate-kit.html 1985 CA emissions 617 owners- You Need This! Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst. Sanden Instalation Guide (post 11): http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html |
#3
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Quote:
i already replaced the computer with a ebay unit same deal for the gauge cluster. im pretty sure the computer works cause my temp gauge started working again once i replaced it. i guess the next logical question is how do i check it? scope and signal? orr is there a more shade tree method? im guessing i just need to pony up and buy a scope... anyways besides the computer, tach it self, and pick up wire, is there any part of the system im missing? also is there a consensus as to what happens or what is fried when you do what i did? (hook up a battery wrong while running) to answer your question about the trans, i kept it attached to a 603. did some other stuff too. the trans days are already numbered. ill look for that user and dm him. thank you. |
#4
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well i resolved the tach issue by finding a picture in a thread on here lol. there was an overload relay behind the glove box on the passenger side "a pillar" that had a burnt fuse. final piece of the puzzle. also this was the final gauge issue i needed to rectify. even the clock works now lol. thanks to this bulletin board
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85 300d 0m603, 717, he341, 50mm external W/G with open dump, intake manifold as well as intercooled. need to figure out a different trans before i throw more fuel at it. the 717 trans and 8" ceramic clutch are already pissed with stock elements. |
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