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...)
>
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.