MSefi.com read only forum (Jan.15,2018)

Testing MS-II V3 with VR circuit. Battery voltage fluctuates on megatune when I raise RPM on the stim.

scnicholl,

The tach circuit on the stim draws a fair bit of current. If you are using a battery or an unregulated supply the voltage does tend to vary with rpm. So check the actual voltage on the the stim with a DMM while changing the rpm - if the voltage varies the same as in the tuning software then that is the case, and you can either:

- get a better power supply,
- get a larger battery,
- ignore it as long as everything else works (but check it again on a running vehicle once installed).

Lance.

Input voltage at stim stable.
Using a 500 mA power supply.

OK now
Had D17 backwards