I just got a 1990 montero that has not been run in 6 years. Motor was out and rebuilt but not in truck. Got back together and will not start. Has as alarm that looks factory that acts crazy when I hook up battery. The only way I can not make it come on is to attach battery cable with ignition in run
Position. I have spark and fuel... Just no injector or tach when cranking. Will alarm cause this? Was this a dealer installed option?

1990 SWB 3.0