Honeywell strobe question

I bought this Honeywell Leiland 64B strobe at a flea market this weekend. The strobe can be operated off of AC wall plug or 3D batteries. I plugged it in for about 2 hours and the ready light flashes but only a spark at the flash sync terminal when I try to trigger it? I also tried with batteries, n.g. I am hesitant to try and form the capacitors by leaving batteries in and switching to battery mode with plug in wall socket. If all else fails, I have someone who does wonders with these vintage units.Thank you