[iamnotahippee]

If you are using an electric pump that requires 200 amps, you won't be able top delete the alternator. You also don't want top be and killing a diesel. Now it doesn't need to all the time, but off and on sure is hard on them. Do you have a plan for the water pump? Do you have an idi 7.3 or a turbo?
You need to do some math here. If you spend all this money to achieve better mpg, how much improvement can you expect? How long will it take to save what you spent to get there? Unless you need the diesel, you could probably pick up a beater for less than you are looking to spend, save more fuel, and not be gambling with the safety of yourself and others with half baked modifications that may or may not keep your steering and brakes functional.