My Rivett 1020S has a 220/440V 13.4/6.7A 60Hz 5HP 1690RPM motor that is
wired for 480V right now. It's been recommended from this group that
it will be best if I rewire the motor for 240V and so that's what I'm
working on, but I still need some help.

The problem is that not all of the wires to the motor are numbered.
Here's what I know:

The only wires that are numbered are the wires from my power panel
(numbered 1, 2 & 3). These leads connect to the motor wires 1, 2 & 3
respectively for both the high and low volt configurations.

In addition to these 3 power lead connections, my motor is configured
for the high volt configuration, and so it has the following wire
pairs: 4+7, 5+8, and 6+9 (unfortunately these wires are not numbered; I
only know this by the diagram on the motor).

There are also two white wires coming from the motor, one is connected
to wire #2 and the other #3.

I want to wire this for the low volt configuration which is: 1+7, 2+8,
3+9, and 4+5+6.

HERE IS MY CHALLENGE: I only know that 4+7 are paired together, 5+8,
and 6+9, but I don't know their numbers... I only know 1, 2 & 3. Is
there a way using a multi meter or other method to identify what the
wire numbers are?

It's going to be VERY difficult to identify the wires otherwise because
the motor is huge and not easily removed.

Thanks in advance for your help.