2001 Other Chevrolet Models Which service manual?

Could you tell me exactly which service shop manual I should get for my 2001 Chevy 3500 Express box van. This is a 1 ton, short nose front end, with the dog box in the cab for engine access.

I have found a few on eBay, but am not sure that they would cover my truck. I've emailed the sellers, but am getting no replies.

I'm having some electrical problems and I need the appropriate manual for schematics, etc. I want to know what the exact name of the shop manual(s) I should look for.

Thanks, nilo