How do I know? I installed a 85 amp alternator with a modern group 34 battery from a Honda accord. I left the interior dome light on while at school. The car started just fine and everything worked, so thought it's all good. Took my friend home, then heading over to another friend's house. Then poof! The ammeter went up in smoke. Took half the dash harness and most of the engine harness. Now that I have have by-pass the ammeter, I could do the exact same thing and NOTHING would happen. ABSOLUTELY nothing. And today, if I had the ammeter hooked up like stock, my big ass alternator would smoke the dash before I left my neighborhood. Giving advice to keep that damn thing dangerous and careless which is why i'm so passionate about it.