Horse manure is a high Nitrogen source for a compost pile with a C:N ratio, depending on age, ranging from 22 to 1 to 50 to 1. For optimum results
I have always mixed 1 part horse manure to 3 parts vegetative waste. That mix always results in a very hot compost pile in a short, 3 days, time.

The coffee grounds would be another N source.

kimmq is kimmsr

The way to tell is to dig into it. If it's extremely hot and/or smells like sewer or ammonia, it needs more carbon. If it's steamy or just warm and doesn't have a foul odor, it's probably fine how it is. Observe and adjust. Also keep an eye on the moisture level, if it's hot it will dry out in a few days and stop cooking until it gets moisture. It should be damp like a wrung out sponge.

> If it's steamy or just warm and doesn't have a foul odor, it's probably fine how it is.

yeah that's how it is, a bit warm and no foul smell. despite seeing a few poop nuggets here and there which are still a bit green from what the horse ate (grass/hay) it doesn't smell at all, it smells a bit earthy.

i started to use some of it in its current form by tilling directly into the soil.. i may reserve some of it and create another pile and mix it with kitchen scraps.