"I have a simple 2 poll switch off and on what is ACC terminal? "
"ACC" is what you get on an auto or "universal" ignition switch that are used on many tractors. A universal switch will have two terminals that get energized when the key is "on." ACC and IGN. Both get energized when the key is "on" but they are isolated from each other when the key is "off." This way . . a Delco can have #1 spade terminal wired to the ACC and the tractor's ignition system hooked to the IGN on the key switch. This is an easy way to have a tractor that will shut off. Otherwise - the alternator will keep charging after the key is "off" and backfeed to the ignition system and the engine keeps running.
"Can I get the 5 amp diode at the parts store? I then wire the diode in between the key switch and the #1 spade poll on the alternator."
Yes. Very cheap at a Radio Shack store. #276-1141 or #276-1143 for $2 gets you a pair of 3 amp diodes you can wire in parallel. A # 55052252 gets you a 5 amp NTE577.
"I have power to the switch via positive side of solenoid where positive side of battery is connected. So I take #1 spade post from alternator wire to switch."
Yes, you can - but it needs a shut-off switch. Even with that . . . if you've got a battery ignition - once started - it probably will not shut off. Same goes for a diesel with electric shut-off. If you've got a magneto or a diesel with mechanical shut off, it won't be a problem. The Delco SI series only needs power to #1 to get started. Once it's charging it will power itself and needs nothing at #1.
"When switch is turned on power will travel to the alternator excite it (tell it to start charging.)"
Yes, but even when that power is off - the alternator will keep charging. It makes it's own "excite" current once charging.
"Regarding the” full field” charge bypass. Where is the hole located in the back?"
There is a small hole in the back of the alternatort that lines up with a metal tab on the internal regulator. You stick a metal prod in there and ground the regulator. That makes run at full charge. It is there as a "test port."
"Is this a one-time only setting and must be done first before starting."
It is only there to diagnose problems. It elimnates the voltage regulator from the alternator. If it charges when you stick something in there - and won't otherwise . . . then you know the regulator is bad or not hooked up properly.
"I stick the small screwdriver in and take it out does this press a tab of sorts?"
Yes. It connects a small metal tab on back of the regulator to the case/housing of the alternator.
"Will my alternator now charge at lower rpm or will it take a while to see it charge? "
All Delco SI alternatorts need to turn around 1600 RPM to charge at all. So much depends on the pulley ratio. That is - the size of crankshaft pulley as compared to the pulley on the alternator. Delcos on cars and trucks often have 3 to 1 or 4 to 1 ratios. That means the alternator has a 1 3/4" or 2" pulley and the engine has a 5- 8" pulley on the crankshaft. For example. If your tractor has a 6" pulley on the crank and a 2" pulley on the alternator - you have a 3 to 1 ratio. Since the alternator must spin at 1600 RPM to charge - your engine needs to run at 530 RPM at least - for the alternator to do anything. Also - alternators need to spin even faster to first get working. Often 2400-2800 RPM. So, with a 3 to 1 ratio that means 800 - 950 RPM with a 3 to 1 ratio, or 1200-1400 RPM with a 2 to 1 ratio.
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