fragmare

So now that I've got the car running the way I want, it's time to finally fix the A/C system. The compressor was getting no clutch action. I had the entire system deep vacuumed so it's empty of all refrigerant/oil. Then I removed the compressor and found a break in the main power wire. I braided, soldered and insulated that, so that's now fixed. While I had the the compressor out, I decided I'd take the thing the apart and inspect it a bit more closely and give it a good cleaning too. After taking the armature plate and pulley off, I noticed something funny looking on the top of the field coil. It almost looks like there's a small "pit" in the resin coating on the coil itself (see pic attached). That half of the coil also looks darker compared to the other side. Did the A/C compressor's field coil get fried at some point or is this simply an imperfection in the resin coating? I tried testing the resistance of the field coil and didn't get any readings, but my multimeter is pretty cheap and inaccurate and I'm not even quite sure if I'm making contact with the right wire... the service manual's diagram is a little ambiguous. Is this field coil blown? For testing field coil resistance, do I test the little black wire that's held onto the compressor by a 8mm bolt?