Yes, they are instructed NOT to hookup jumper cables for that reason.
The liability is theirs if they blow your ECU because they boosted it
from the vehicle battery. But they can replace the battery roadside for
you, if it's dead. You may have a charge problem causing chronic low
batteries requiring frequent replacements.
   Let us know what the cranking voltage drops to....

Mike B.

On 12/14/2012 8:17 PM, neil n wrote:
> Ok.
>
> Yah that makes sense. If the vehicle battery is a large load
> (depleted) booster won't do much. Kinda pissed the guy didn't take the
> time to jumper my van from his truck. But then maybe it's a liability
> thing (modern electronics getting damaged by using jumpers from a
> running vehicle?)
>
> Ya, PO reciepts said both (aux) batteries replaced not long ago. But I
> don't drive this van much. This and the remote PDL system may have
> taken it's toll.
>
> Neil.
>
>
> On Fri, Dec 14, 2012 at 4:34 PM, Mike B <mbucchino@charter.net> wrote:
>
>> Now that you've re-charged the battery, check the voltage drop while turning
>> the key to crank the starter.
>>    BTW, those battery boosters will only assist starting a slightly low
>> healthy battery.  If it's really low or dead or not good anymore (old?),
>> those battery boosters won't help at all.
>>    I need to see the cranking voltage drop (or lack thereof!) to troubleshoot
>> further.
>>
>> Mike B.