A minimum of 13.4 running with lecky bits off@idle.
With lecky bits on, it can drop to 11.5 or so, BUT so long as when revs increased and held, it picks up to 12.7-12.8 or over all is well.
This is dependant on several factors though such as the battery being FULLY charged when you test it.
A much easier way to look for drain is to insert a 3/5watt bulb between one of the battery leads and it's post, any more than a faint glow is not good, but does depend on alarm type tracker etc, cliffords tend to use a bit more current than others.
tabetha