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I have a Suzuki Df90A on my Montauk that has been hard to start latest time.
Two new battery are installed and connections on battery cables are cleaned from oxides.
The motor only starts with both batterys connected. last saturday the motor stopped when running after a few minutes.
Couldn't start it after that. The solenoid clicks thought (both with one or two batteries)
I charged the batteries over the night and it started day after (only with both batteries)

I left it to the workshop now and they haven't found the problem with the motor stoping after a few minutes.

When leaving it to them we discussed bad electrical connection and also that the battery cables were very long and old (1997 from old yamaha motor which were installed before)
I talked shortly this morning with one of the guys from the workshop but forgot asking if they tried with new cables. He only said they still have the problem with motor stopping after about three minutes but he said it started even on one battery now, they are now waiting for support from Suzuki. They are a authorized Suzuki workshop and have good reputation.

Anyone who have had similare problems or any good ideas?