Am measuring 12.6v at battery and starter motor. 12.5v at the coil with ignition on and comes down to 10.8v when cranking (relay used per MSD recommendations) therefore I need to find that extra 1.2v + for the MSD coil to produce a spark.
Have a new Optima red top battery (load tested and passed no probs at all), 38mm square cable from battery direct to starter (approx. 300mm length and rated for 255 amp current flow), 2 of 38mm square earth cables running from block to negative and chassis to negative (Ohms / resistance checked all good). Starter motor is a new high torque 2.4hp unit.
All other ignition and battery circuit have been tested with a voltmeter and earths are good - no issues.
This is really starting to do my head in now, what could be the cause of such a big volt drop at cranking? Could it be the high torque starter hmmmmm
Just curious what are other people getting at there MSD coils while engine is cranking?
Thanks
Edited by Ryno364, 16 March 2017 - 01:20 PM.