robsrotech
New Member
- Joined
- Feb 5, 2010
- Messages
- 7
My 914 tach will not work on the D120.
Test 1- If I run the D120 directly off the trigger coil it works but if I run it through the TCU it will not.
Test 2-Both the TCU and the trigger coil put out the same millivolts at a given RPM so the signal is not being lost in the TCU.
Test 3- I power the TCU off a separate battery/ground source the D120 tach works fine so it appears to be a ground loop problem.
Any suggestions?
rob
Test 1- If I run the D120 directly off the trigger coil it works but if I run it through the TCU it will not.
Test 2-Both the TCU and the trigger coil put out the same millivolts at a given RPM so the signal is not being lost in the TCU.
Test 3- I power the TCU off a separate battery/ground source the D120 tach works fine so it appears to be a ground loop problem.
Any suggestions?
rob