I had the battery and Alternator tested and they said they where fine. I am thinking about replacing the Alternator anyway. What size should I get.

I have an msd 6al, blaster 2 coil, electric water pump, dual electric cooling fans out of a newer 3rd gen, wide band o2, 4 channel data logger, scarcely used fog lamps, may get a electric fuel pump at some time, no radio, and no hvac system.

Would a powermaster 80 amp Alternator be big enough.

 

I should probably tell you guys this is a single wire in an 84

 

Lots of short trips? At low rpms, an alternator is barely putting out enough to run much less recharge so after several short trips, the draw of starting a car plus the pull of the electrical components can weaken a battery over several trips.

 

I never see 13 volts on my gauge and turning things on drops it further.

 

sounds like a alt problem, if u still have it off spin the pulley by hand and see if u hear the bearing inside it.

 

It didn't feel quite rite

Is 80 amps a big enough alternator?

 

80 amps is plenty for the electrical accesories you listed
~50a would probably do the job. Sounds like there is
something wrong with your alternator or wiring...