Ill TRY and make this short. lol. I added aux painless fuse panel to run gauges and off road lights, I added some off road lights, (2) 100watt & (2) 55watt I added a dual batt. setup using hellroaring isolator. I added 9k winch. The way the dual batt setup was, the 2nd batt was strictly standby, all my stuff connected to main. I could combine them thru hellroaring switch. All this using dual redtop optimas and factory alternator. Now for the issues: I replaced the 100watt lights with 135 watt lights and added a Mean-Green 200amp alternator. When I would drive truck like normal with headlights on, things were fine, as soon as I hit the off road lights the belt would squeel really loud. Thought it was loose belt, it wasnt. So, I replace the belt with brandnew one, same problem. I tightened belt again and went out last nite. When I would first hit off road lights, it would squeel, then it would keep doing it with headlights on. Id tighten belt and if that would help, it did not. Then my factory volt gauge was reading 10-11volts no matter if the headlights were on or not. I put org. alt back in truck and still got low volt and some squeeling. This morning, I disco'd all my extra accessories. The truck was returned back to "normal" there is was no excessive loads put on it. I disco'd the back up battery, the isolator, all the extra gauges and lights and winch. Now its reading correct volts, but if i put on headlights I would still get squeeling. I swapped batts around and it wouldnt do it as bad, but if I was at a dead stop and punched it , it would squeel. Went to auto store to have batts and alt. checked. Said the alt. readings were okay, but Ive got a connection at the top that doesnt look the greatest, kinda cruddy, etc. When I punched the gas to show him the sound, he heard it and then told me to turn it off. He climbed up and wiggled the rad. water pump blades. There was quit a bit of play in the front of the water pump. He seemed pretty concerned about that. I picked up a new water pump and new alt. connector. I havent had time to change it all, dunno when I will. But my question (and there are a few of them) are as follows: 1) can bad water pump cause these crazy alt and electical issues? 2) how hard is it to change waterpump in these things, I have A/C but no smog pump 3) what else could I look for, inspect, change, replace, etc. 4) why would the hi amp alt and bigger lights cause this, they were put in at the same time, so I cant say its one or the other. 5) the high amp alt was tested and it was fine, putting out 16v at full power (tested at autostore) & both batts were tested and took 6amp load and recovered. Any help or suggestions is greatly appreciated.