genoredstar Posted April 16, 2010 Share Posted April 16, 2010 Does any body know how to test an electronic tach. I've got an E tach from an mr that i want to install in my r model. I think i have all the wiring right but don't know if my sensor or pickup is functioning or if the tach is bad. I've got the pos and ground on the tach hooked up and two leads to the pick up on and have a little clearance from the flywheel., but no needle movement. I get a little bounce when it wakes up to voltage initally but nothing later when engine is running Quote Link to comment Share on other sites More sharing options...
Rob Posted April 16, 2010 Share Posted April 16, 2010 Does any body know how to test an electronic tach. I've got an E tach from an mr that i want to install in my r model. I think i have all the wiring right but don't know if my sensor or pickup is functioning or if the tach is bad. I've got the pos and ground on the tach hooked up and two leads to the pick up on and have a little clearance from the flywheel., but no needle movement. I get a little bounce when it wakes up to voltage initally but nothing later when engine is runningYou need a pulse generator outputting about 5VPP signal varying in frequency to check the tachometer independent of the sensor. If you want to box it up and send it to me I'll check it out for you. I have a test jig for doing what you need.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment Share on other sites More sharing options...
genoredstar Posted April 16, 2010 Author Share Posted April 16, 2010 You need a pulse generator outputting about 5VPP signal varying in frequency to check the tachometer independent of the sensor. If you want to box it up and send it to me I'll check it out for you. I have a test jig for doing what you need.RobRob, Playing with a ground wire if i pulse one of the signal terminals i get movement on the needle . Am i correct in thinking its the pickup? Quote Link to comment Share on other sites More sharing options...
Rob Posted April 16, 2010 Share Posted April 16, 2010 Rob, Playing with a ground wire if i pulse one of the signal terminals i get movement on the needle . Am i correct in thinking its the pickup?It could be and is the least expensive part to replace. Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment Share on other sites More sharing options...
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