High current draw effect on low current components?
You seem to be suggesting a circuit like this.  The question is whether the high current of the right load will effect the left load.

The answer is no.  The amount of current of the right load will not cause the left load to have a high current.







simulate this circuit &ndash; Schematic created using CircuitLab

The only effect that could happen to cause a problem is if the high current load were to cause the voltage input to the low current load to drop.  This could cause noise on the low current circuit.
If you want to avoid issues such as this, you can use a star topology back to the source like below.  Now they do not share current paths.







simulate this circuit