What to do Putting a power steering pump in a 89 S10 truck broke the bolt on the alternator that holds the bracket what to do?

remove alternator and bracket.with a drill bit smaller in size than he the thread on the broken bolt, carefully drill broken part of bolt that is still in engine.then use an" easy out " to remove broken peice.an" easy out" can be purchased with the correct size drill bit if you know the bolt size.