Normal battery drain 92 GMC?

Anyone know what the normal battery drain (when not running) on a 92 GMC Sierra should be?
I looked in the GM factory manuals and could not find amperage draw listed
for anything.
If anyone knows what the amperage draw (when off) is of individual electronic gizmos, that would be helpful. Like factory radio, PCM, ABS, and electronic A/C control...
Also does anyone know if the PCM (and other electronic things) are "awake" when first powered up, then go into a low power sleep mode? And how long it would take to go into the sleep mode?*
*The reason I am asking that, is if I disconnect a battery connection, then place an amp meter in series with the connection, then read a high amperage draw, perhaps this is just everything being initially powered up. Then after a period of inactivity (how long?), everything might go into a reduced power "sleep mode" and then draw less amperage? (So I should not use the initial amperage draw reading in that case, but wait, then see what it is reading...)
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On Sat, 15 May 2010 14:18:00 -0700, "Bill"

Rule of thumb is max of about 50 MA, with a 20 minute wait (doors all closed, all lights off, including hood trouble light if so equiped) is acceptable. Many vehicles do stablize in a few minutes but some take longer.
I've never seen current draw ratings for individual components.
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