Volvo KAMD300A won't crank

Assuming the battery posts are clean + leads tight ? ..


How salty are the ignition barrels and there connections ?
Next if fitted how salty / ver d Gris are the fire suppression system engine shut down connections ?
 
Assuming the battery posts are clean + leads tight ? ..


How salty are the ignition barrels and there connections ?
Next if fitted how salty / ver d Gris are the fire suppression system engine shut down connections ?
I presses the battery parallel button and started without any problems. So it might be a battery issue. Thanks
 
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