Dolly is a Ford or Chev?
Hi Lauren
If Dolly is a Chev and just goes click on a fully charged battery, as said the most likely cause is a bad connection on the battery. But also check the other end of the cable, I have had problems with ground connection as this one is made through the engine mounts from the chassis in many cases, I've added a cable directly to the engine. The other trouble spot on Chevy is the contacts in the starter switch.
If you have a Ford with the remote electric solenoid don't know what to tell you.
Also if as you say, your cables are bit duff by all means replace them with the heaviest cable you can find often called welding cable, I forget the size about 1/2" of fine copper wire. When I make these up I go to the industrial electrical house and buy the length I want along with the lug cable ends I prefer to solder the ends on instead of crimping. Same with the battery ends from an automotive supplier. But do make sure it is well clamped in position and that nothing else is hitting against it to wear through. I all most lost my truck and shop because of a cable fire a couple of years ago.
Now as to the circuit breaker, the original vibrating type are difficult to find. I've gone over to a standard thermal 30 amp truck breaker. Of course this does nothing to protect the hot battery cable. After my experience I've slid a piece of hose over that at critical points.
Cheers Phil
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