I am new to this and in need of some advice.
I just purchased a 1999 Jeep Cherokee 4.0L, with 211,000 miles and have some electrical problems. I noticed that one of the two green wires on the back of the alternator had been cut and ran to the negative side of the battery. I fixed it and spliced the wire back together so its like it was from the factory. When you start the Jeep it runs really rough and stalls sometimes. The check engine light comes on as well as the check gauges light.
I tested the codes with my scan tool and it is throwing a P0123 TPS sensor high input code, and a P1698 No CCD Messages Received From The TCM code.
I bought a new battery and replaced the terminals. I did a complete tune up (Plugs, wires, cap, rotor, air filter, oil, etc.) Changed the TPS sensor and still the same thing. I'm not sure where to turn next and don't want to start throwing money at different things and hoping for the best. Any ideas on what I should try next? Also I tested my charging system and the new battery shows 0 volts. I'm testing the alternator tomorrow, but don't think that would cause all my problems.