<BLOCKQUOTE>quote:</font><HR>Originally posted by RC 70:
Wait a minute. If I have a 37 amp alternator, wouldn't it read 37 amps or just below or to the left of 40 on my amp gauge?
What does everybody elses amp gauges read on a 70 BB?<HR></BLOCKQUOTE>
Sounds like you are mistaking amps for volts. A lot of people do. Volts are considered "pressure" while amps are the amount. Voltage should stay the same while amperage goes up and down, depending on what the car needs.
If you really have a 37 amp alternator (yours is bigger than that) and the car wants 37 amps to runs, the alternator would be too small. You always want an alternator bigger than what you need.
Confusing things a little is that a lot of car amp meters are really volt meters, even though they say amps on them. They don't really measure amps that the car wants. They only show an indication that the voltage is going up. When the car is off you measure 12 volts from the battery. When the alternator is working, now you are reading higher, around 14.75 volts, so the meter goes up. Maybe that helped?