Mamiya 7 II + Flash

Hi all.
One week ago I purchased a Mamiya 7 II with 65 f4 and 150 f4.5, for to replace Mamiya 6 MF that i bought four weeks ago, problem with the locked film advance lever.
Do you know what flash work with the 7II, I have a Metz 32 MZ3 and don't work with this one.
I have a Canon 580 EX but I don't know if is good.
Thanks in advance.
Sorry for my bad English.

Canon EX flashes have contacts for communicating with camera. Those communication works only with Canon cameras. So, if you want to use EX flash on other than Canon camera you must do next: You must isolate all contacts on flash except central contact. You can then try to use commands on flash itself to adjust zoom of flash head, how strong flash will fire and
everything else. So, you will have manual flash not automated flash, that means you will not have TTL mettering, you will have to thing about aperture of lens, subject distance, subject/scene brightness and everything else one should think of when use manual flash.

That way you can use Canon EX (or any other flash which have manual commands on flash itself) with any camera.

Only problem is using electronic cameras with old flashes which have high trigger voltage (up to several hundreds of Volts), those flashes can destroy electronic circutcy in camera. Canon EX flashes have max 6 Volts of trigger voltage, so no problem with EX flashes. And newew flashes also have international standard voltage (12 or 24 Volts max, I am not sure), so no problems with new(er) flashes too.

Surprised to hear you have had problems. I have used a 7-II successfully with the basic Metz 36 C-2 model. Worth checking the basics like contacts are clean? Otherwise suggest that you try contacting Metz.

I use a Metz 54 MZ 4i with great results. You need the basic SCA adaptor (with just one contact), and set the flash to A mode.
The Canon flash is not a good choice for the Mamiya camera.

get an $85 Vivitar 285HV....More than enough and simple.

Thank you vey much for your kinds responses.
To the end I changed the module of the Metz 32 for the standar one, and work ok for the moment.
Thanks again.
Regards