Cross check,sorry,you are wrong.The starter pneumatic off-take is before the bleed valve on the classic [-3/4/500 as well as NG] but it is after the bleed valve on -200.That's why PifPaf is correct in saying you need bleeds on for engine start on -200's.You can start engines with the bleed switch off on -300 and beyond.
Also,the Isolation valve is buried in the keel beam within the air con bay,not the MLG wheel well.
Being a 'heavy',I would have to look at the wiring diagrams for the electrical side of this debate.