Reducing induced voltage in pump control panel

[Dubl-P]

Good day all.

I have an audible alarm going off in a septic pump control panel which is sounding off in a flickering/ intermittent way when the float switch powers up the pump.
I believe this is due to induced voltage because the float switch and power wiring was run in the same conduit, contrary to the manufacturers instructions as shown on the label on the panel cover.
We are in the finishing stages of the project and it would not be great to dig now to run a second conduit.
I am looking for the band-aid solution.
Can I install a resistor or something like that to manage this trickle of power and prevent the alarm from going off under less than fully powered conditions (when the alarm float switch is actually activated)?
Photo at this LINK
Thanks for your attention!

 

[ptonsparky]

You could try pulling in a shielded cables to the float switches.
Do you have the ability to measure the voltage?

 

[don_resqcapt19]

I have added resistors as loads more than once on PLC inputs that had issues like that.

 

[Dubl-P]

I will measure the voltage tomorrow and see about feasibility pulling a fresh shielded cable for the alarm.

What kind of resistor would be appropriate in this setting?

Thanks for your comments