Help! My son and I put a new starter in his 89 Bonneville. It started fine but was kind of slow turning over. He put in new plugs and wires and now it wont turn over at all! I think he got his wires crossed. Can anyone help me get a firing order diagram? Thanks

However even if he did screw up the firing order, the car should still turn over ok, right?

It should turn over, however it done incorrectly a certain way, it may crank strange.. in that for one or two cylinder firing it almost makes the starter stop because the cylinder fires extremely early.

If anything, pull the plugs and make sure the starter is working. With the plugs pulled, there is significant amount of resistance removed.. so it makes it easier for the starter to crank over.