MEXICOWANDERER wrote:
Simple switch circuit to fool you voltage regulator into charging about eight tenths of a volt higher. I must have installed five dozen of these on Ford and Chevrolet charging systems.
Depending on how fast and easy it is to pass two 16 gauge wires through your firewall and punch a 15/16" hole in your dashboard, this is a simple and bulletproof way to allow your charging system to (example) charge at 14.8 volts rather than 14.0 volts.
The principle is easy to understand. The 2G and 3G Ford alternator voltage regulator to provide power to the alternator field. Not only does it supply a max of around 5 amperes at full load this wire is also the -voltage sensing lead-
"Magic" will make this wire have about .8 lower voltage. The regulator sees the lower voltage and says "I have to charge .8 of a volt higher to meet my goal".
A switch in or out rectifier is placed in the feed wire that gets cut. The yellow wire see the picture below.
The switch is an ON/ON switch with no ability to switch completely off. If you want to get fancy an LED pilot light can poke through the dash announcing when the regulator has been switched to pass field current through the rectifier.
The rectifier itself it neat with it's own heat sink. It has four terminals but only two will be used. Push on terminals without wire can cap the two unused terminals. The rectifier is insulated so there is no exposed voltage points to short.
Yep, it costs money for the parts. Yep it costs money for gasoline too. Less run time means less fuel.
See the yellow wire that's the wire that will be severed and extensions to the cab will be put on both ends.
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No need to use a power rectifier like you've shown, the sensing circuit carries no appreciable current. In my last vehicle, I just used a couple of 3 amp diodes in series to get about a 1.4 V boost, with a switch to bypass as you've done.
