PicoScope 7 Automotive
Available for Windows, Mac, and Linux, the next evolution of our diagnostic scope software is now available.
Hi Vahalla, how close do you have the current clamp to the starter motor, is it possible the high current loads/magnetic fields are interfering with the clamps circuitry somewhat ?As shown on the attached trace, which has starter current draw measured on a clamp at the starter battery +ve feed wire near the solenoid, not only
Thanks for the suggestions. I have a new relay on order as well, so I hope to do a "before" and "after" on the switched side. I was having the very same thought last night that the switched-side might reveal what is going on!AWright wrote:Hi Vahalla, how close do you have the current clamp to the starter motor, is it possible the high current loads/magnetic fields are interfering with the clamps circuitry somewhat ?As shown on the attached trace, which has starter current draw measured on a clamp at the starter battery +ve feed wire near the solenoid, not only
Can you scope voltage of switched side of solenoid ? It may provide some clues to its condition
Many thanks for this. I believe that this is the direction I am going in, so a useful case study like this one is great. In particular, I suspect starter solenoid "chatter" to have been responsible previously for a "grating" noise on crank, previously reported by the customer last year. This was addressed at the time by fitting a new starter motor assembly, but that may have just hidden the symptoms of the problem - possibly in the solenoid supply circuits.sigoaprendiendo wrote:Here you are an analog very interesting case of study
http://www.picoauto.com/tutorials/ferra ... stics.html