Flux the cables, use a blow torch instead of soldering iron. Those cables take a huge amount of heat as they are millitary spec cables.
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Which stuff do you use for flux the cables? Kolophonium?
What temperature should the blow torch have (roughly)?
I use MG chemicals Rosin Flux (Flux Colophane)
I just set it to the max on the torch fitting:
I first get some solder on the cable, just be careful as the flux can draw the solder quite deep into the cable. I actually have the cable point slightly down so that it it doesnt draw in too deep.
The I hold the connector with needlenose pliers and heat it up with the torch and use, add some solder and then get it onto the cable.
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Goot bs10 and 80w soldering iron , I recall no problem at the time
I think I soldered first the wire then « grind »it to the connector shape and soldered to the connector
Do it this way now on , so the wire is full
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You could crimp it to a connector if it still refuses to accept solder when properly cleaned and fluxed.
If you can please Crimp connectors 
Its 100% good connect betwen
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Dave or Juha, do you have a photo of what the crimped connection would look like? and what the fitting is? Thanks
I am sure there are more applicable solutions for a specific board and specific use case, but here are a few options:
https://www.digikey.com/en/products/detail/te-connectivity-amp-connectors/34321/287750
https://www.amazon.com/dp/B07SK6JHC3/ref=cm_sw_r_cp_apa_fabc_S18SEDPKVST8PRP6YWCC
Or use something like this, but for 8 AWG (this is for 6AWG) https://www.mouser.com/ProductDetail/Amphenol-Industrial/SLPPA16BSO?qs=G2fvz%2F8gJKKurY097qFkqw%3D%3D
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