97 gtx starting issues

[stevethegas]

hi all my 97 gtx is having problems, the machine starts up with a bit of effort in the garage (bit of priming) but get it in the water and it becomes differcult to start. it turns over slowly but if i remove plugs it spins over quickly, ive replaced starter and battery it almost goes to a hydrolic lock. im sure its not head gasket as it runs too well, but i was thinking battery cables may be losing voltage under load does this sound likely or does anyone else have any other ideas?

 

[Bills86e]

Yes, thats VERY likely if the cables get very warm or hot. It may be the starter is rusty internally and needs
new brushes too. I cut the battery cable lugs off and solder on new lugs, and marine shrink wrap with a torch.

 

[stevethegas]

ok thats cool, im sure its not starter as its 7 days old as is the battery