SCORE on alternator !!

You might find that under idle with the fans kicking in it will draw quite a few amps . You are running relays with the fan& pumps ? and the msd will require full 12 V. I found with mine running a single fan electric pump 6AL with the Sniper setup with a 70amp setup would draw too much @ idle dropping voltage to 10.00-10.5 and I have no radio all my lights bar head lights are LEDs I ended up with a power master 95amp now under idle wth everything running 13.5 13.8v.