I replaced my ignition switch last year after having a slight hot start problem, but mainly as preventive maintenance.� 
Seemed so-so at first, but this year the problem has gottem�worst; I�figured "crummy replacement switch",�so I replaced it again, but the problem remains.� 
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I thought it might have been just a low battery due to lack of use, but�on a hot re-start, typcially�the engine just barely seems to crank over and then catch.� But here's the kicker, one time on a cold start, � I turend the key�and nothing but idiot lights,�then I retried and it fired right up.� Possibly not related, possibly I just did not turn the key all the way as I was hurriyng to leave a camp-ground and follow friends - I am not sure.� The cold re-start problem only happened once, although it seems that the engine does not turn over as fast as it should, even cold.� 
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I've order a hot start relay kit, but should I focus on now?� I'll look and clean the starter contacts and chassis�grounds.��
Also, I found an old post by Zoltan than mention starter brushes relative to this problem.��
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Van is an 86 Wolfsburg Westfalia "weekender" camper with factory 2-battery set-up, but I only have one battery installed right now (I do have a 2nd battery not presently installed)
�4-speed, no AC or power optiones except mirrors.
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John
LiMBO