Mercedes-Benz Forum banner

w123 tachometer

2K views 3 replies 3 participants last post by  dega 
#1 ·
hi. i would like to know why my 230 (w123) won't accelerate or accelerate really rough when i connect the tachometer on the ignition coil. thanks.
 
#2 ·
I don't think it's supposed to connect to the coil directly, it seems there should be a connector block on the left inner fender with maybe 2 green wires connected together with a phillips screw. We had problems with the tach having a short in it causing the ignition primary signal to diminish to the point the ign. didn't work. Is a stock setup? and what year is it?
Bill
 
#4 ·
I'm using this method and worked fine. From the behind of tacho unit, connect the (+) to the clock wire (+) and the (-) to the coil (-). It just using one cable to the coil to catch the ignition pulse.
 
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top