Re: fine tuning electrical/12 volt systems
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Those who are in the marine/yachting/sailing field often know a great 
deal about optimizing 12 volt power systems. They must....they live on 
them at sea.

Some extremely well written books on the topic are available in a number 
of sailing/yachting stores.

For example:

Wiring 12 Volts for Ample Power
David Smead and Ruth Ishihara
Rides Publishing Company
2442 NW Market Street #43
Seattle, Washington 98107

also good by these people, even better is:

 Living on 12 Volts with Ample Power

Lots of schematics, sources of 12 volt tweaking supplies, lists, etc. etc.

The 12 Volt Bible For Boats
Miner Brotherton
Seven Seas Publishing/International Marine Publishing Company
P.O Box 220
Camden, ME  04843

Chapter headings:

Basic Theory of Electricity
Electric Circuits
The Battery
The Wiring
The Controls
Transducers
Recharging the Battery
Trouble Shooting the System
Using Meters
Locating faults

The 12 Volt Doctor's Alternator Book
Edgar J. Beyn
C. Plath North American Division
222 Severn Avenue
Annapolis, MD  21403