Help needed.

Can anyone help with the Rx battery wiring it has 3 wires red black and blue original  with a Futaba FP-T6DN set circa early '70's
I pulled the old gear from my Schooner to find 4 ruptured NiCad's and nothing left of the wiring I  assume  it's

+2.4=red-----  neg=black----  -2.4=blue.

I'm averse to just trying it in case I damage this vintage 6ch Rx.

I thought I'd taken the batteries out when it last sailed 15 to 20 years ago oooops. 

no idea..

you might get lucky here tho

http://www.futaba-rc.com/downloads/manuals.html

Unfortunately not Aron the manuals stated the same designation but a decade later with the then new 3 wire servos thanks for trying though.
Looks like I'll have to try it and hope my guess is right.

I've worked out the wiring with help from my son red - black = 6v & red - blue =3v