Serious voltage drop
Ok so battery light comes on on the way to work. Head over to advanced after seeing that one of the batteries (cheap duracrap/Advancenothing brand) was leakin. So I drop 400$ on a good charger and two optima red tops.
go out to the truck to start her up and it was cranking but no start. Tried again and same thing just more sluggish. So I replace the batteries and it starts, slower then usual and the battery light is still on. I drive it around a bit (15 minutes) and it will come on at idle and shut off under heavy load.
truck has a very slight cycle, as in it sounds like the voltage is dropping and kicking the alternator back on. I am thinking the voltage regulator is messed up on the alternator.
Any other ideas?