[TenTec] Power output 580 Delta

[Bill]

Hey all,
First post to the group but I will say you all seem to have so much on 
the ball.
Thanks for being there...(here).
Reading abt first rigs, caused me to pull my 580 Delta off the shelf to 
decide what to do with it,
Can you tell me what may be acting up? (First-rig tale is for another 
thread.)
Drive light does not light...it did previously. It's connected per 
visual. (Maybe connection needs to be turned 180 degrees then 
reconnected?). Manual does say it may not light even though ample power 
is there.
Wattmeter  (old MFJ 816; only used on this rig) shows CW mode power-out 
close to 100W into dummy load if I turn Drive almost full. Same reading 
if I use a MFJ 993 tuner.
Readings are only about 15W when talking into the TenTec #700 mic on SSB 
using dummyload. Louder than normal voice will get a little higher 
reading on wattmeters, A harsh sound, like the word 'tooo', spoken 
loudly, will produce a 50W+ reading. But not near the output on CW. And 
I really don't want to be yelling into the mic...kinda competes with 
XYL's TV volume.
TenTec PS #280 shows almost 15V output.
The Delta pull/push-on/off switch not working (AF portion is ok).(One of 
the reasons I put the 580 Delta on the shelf.) But because of earlier 
discussions I am looking into either a new switch or a replacement for 
the unavailable Model 1140 circuit breaker.
So my question is what may be causing this difference in output between 
CW and SSB?
Thanks, 73 Bill K4VET