Fuse box draw- need help with breaker circuit

[Thor Wicklund]

I have a 1 amp draw on battery and have narrowed it down the battery circuit breaker in the lower right of fuse box. It is the lower one missing in the picture. If I pull that 30amp breaker, it kills the engine, which is confusing as the one above it is labled ignition, anyways, can someone tell me what items are that circuit, so I can start unhooking and trying to find the draw. Thanks

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[Thor Wicklund]

sorry this is a 91 GMC k1500 with a 5.7

 

[AK49BWL]

That breaker goes to fog lights relay, defog switch, power locks... That's it. So the fact that pulling it kills the engine is very odd. The fusible link that feeds that circuit breaker ALSO feeds the ignition switch, however...

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