I just had that same issue with the brothers D2 in my yard yesterday.
I've been fixing up the centre console and heater fan, it's taken a long time(maybe 5 weeks) car just sitting.
Did do a start or two, but don't have a charger ATM, mine's busted. 
But with the mangled mess of wiring and runnign the heater fan for a while, I've drained the battery, I think the start went down to low 11s, aux high 11s.
Did the same thing on start up yesterday, where it wound over for a sec then just stopped cranking. 
Pushed the over ride switch on the dual battery solenoid, and still not enough to get more than that short sec crank.
Hooked up the truck battery .. mongrel heavy bar... stool that it is, cranked instantly.
Had it running for a good half to one hour just to give the batteries a bit of an advantage for this morning, and no problems cranking this morning 
Hopefully just a low battery, if it's been sitting for a bit.
				
			 
			
		 
			
				
			
			
				Arthur.
All these discos are giving me a heart attack!
'99 D1 300Tdi Auto ( now sold :( )
'03 D2 Td5 Auto
'03 D2a Td5 Auto
			
			
		 
	
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