i have an 91 crx si i just swapped a b18a1 in it i have double checked everything and i can't get it to crank any advice will work please and thank you

 

Check your grounds...

The wire harness ground..
Goes nex to the thermostat on the back of the block

Motor ground..
Its the wire on the valve cover on the front of the the motor drivers side.

Tranny ground
Wire comes from the wall to the tranny..passanger side

And what should of been the first
STArter ground wire...
Skinny black wire that falls off once in the blue..

 

good info,i'm goin through the same issue with my ls

 

Thats not a ground wire, its the starter signal wire from the ignition.

Starter grounds through the case.

Sounds like a ground issue for sure though. If you painted any brackets(i.e clutch cable) make sure the surface where the ground attaches is free of paint.