The only starter relay there is resides on top of the starter itself. The relay under the dash is the starter lock out for when the transmission is in gear on an automatic. It won't allow the starter to engage when in gear.
If you're running a separate cable to the starter and it starts, check your positive and negative cable connections and clean them with a wire brush or trminal cleaner. I npect the cables themselves. The temporary battery clamps are bad news.
Also throw the battery charger on a trickle charge and have it load tested.
Cris
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