You could buy a Lehle switch, or simply use one on each separately. If you are using a multieffect unit you could make a Y cable to take the output to both amps but that will not allow you to select the drive channel - you still need the Fender footswitch for that, one for each amp. Lehle is a German company and they make a lot of different footswitch combinations but you will pay for the convenience.
I recommend the Fender single button footswitch for this use - Type: Footswitch
There is a reliable professional way to do this. Open the footswitch and note the tyIe of switch.(dpdt, spdt etc) then order up a swItch that has twicethe required number of poles, essentially creating an isolated duplicateside by side cifcuit. Then you woild run sepatate cables to each amp from your new custom double switch. This would maintain isolation of the citcuits. And It only usIng one amp just run one cotd. No muss, no fuss. Professional and above all reliable
SOURCE: Fender Hot Rod Deluxe Footswitch
Main thing to verify is that the particular footswitch and cable you have is specifically for that amp. If it is not the right one, that is your problem as there is very little compatibility among footswitches.
Looking at the schematic, plugging in JUST the cable shifts operation as you observed. This uses a crazy circuit in which AC is applied on the cable and the footswitch has a diode each direction that causes the amp to shift between the states. when you plug a bare cable in, it disconnects the internal diodes and switches for control at the amp, hence the signals float.
You should investigate the footswitch to make sure it is the right type with the diodes resistors and caps that is for the Fender Deluxe.
You can find the schematic for the amp here:
http://www.fender.com/support/amp_schematics/pdfs/Hot_Rod_Deluxe_Schematic.pdf
Look at the circuitry of the switches on the schematic at C8. Your pedal should have similar circuitry. Assuming your cable is good, the problem would be in the pedal itself.
SOURCE: my fender hot rod deluxe
Realize that the number on the volume control is only relative... it means nothing regarding what the amp can produce. With a high level output guitar you can easily drive the amp into distortion at very low volume control level settings... what counts is the actual output sound volume and specifically the voltage output going to the speaker. Once the amp reaches saturation, any further input just pushes it into distortion or "flat topping".
An oscilloscope on the output will quickly show when amp starts to flat top.
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Thank you steve for the idea
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