A blower motor can draw 10 to 15 amps .
If you're blower motor work's in asc. Mod motor is fine. It's more then likely you have a relay problem,Or someone has wired or jumped a wire that is drawing to much power.
In accessory mode you won't notice the high current draw because the alternator is out of the circuit and the engine is not running. With the engine running, you will see the excessive draw on the volt/amp gauge. If bad enough it will pull the idle RPM down a bit.
Your blower motor is bad or the wiring has deteriated to the point of causing a high current draw. A good auto tech (or knowledgeable friend with a DVOM and amp gauge) can diagnose the problem in 10 minutes.
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