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You can also check alt output with one of these. The load adapter in the foreground is kinda cool. Put it on the battery and connect the cable to the other end, crank with the buss bar in place (to check alt), disconnect buss bar with the thumb screws and the scale reads up to 90amps with the resistor that's on there now, or you can put a different one on and read to 180 amps.
It also works on the new GM HEI ignition systems!
I've had this thing for years and it still works. Bought it from Sears in the late 70's and it broke the bank at the time lol. The instruction manual has pictures of cars from the 60's and even discusses testing generators. I think it was old when it was new!
WOW! I forgot about that analyzer. I have that same one buried in the back of the garage. Time to bring out old reliable. Thx for memory jog