841 Battery Discharge update 12V

Used the advise from you guys and ran #1 alternator wire to cool side of junction box and #2 wire to alternator stud. This results in no charging and 12V on meter. Swapping wires resulted in 14.5V on meter. My old Delco does not have terminals marked #1 & #2 but R & F. With field wire going to junction box and R wire going to alternator I get the 14.5V mentioned but get battery discharge overnight. Could it be that my Delco is older than models having terminals numbered? Sorry for my electrical ignorance. I really appreciate your knowledge.
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(quoted from post at 09:28:51 09/22/15) Used the advise from you guys and ran #1 alternator wire to cool side of junction box and #2 wire to alternator stud. This results in no charging and 12V on meter. Swapping wires resulted in 14.5V on meter. My old Delco does not have terminals marked #1 &amp; #2 but R &amp; F. With field wire going to junction box and R wire going to alternator I get the 14.5V mentioned but get battery discharge overnight. Could it be that my Delco is older than models having terminals numbered? Sorry for my electrical ignorance. I really appreciate your knowledge.
&lt;image src="http://forums.yesterdaystractors.com/photos/mvphoto28061.jpg"/&gt;

&lt;image src="http://forums.yesterdaystractors.com/photos/mvphoto28062.jpg"/&gt;
=1, F=2 do you have resistor, bulb, or diode in switched wire from junction block?
 
You've got me on the right track. The charging system does not charge and the light is on at startup. When #1 wire is jumped to alt. stud charging begins and lamp goes out. Charging continues throughout idle range but when tractor is turned off then restarted, system does not charge until jumped.
Wires are hooked as follows. Alt. stud to hot side of starter solenoid. #1 wire (R) to indicator lamp then from lamp to cool side of switch. #2 wire (F) to alt. stud.
If i'm understanding the problem is in the isolation circuit. Tractor shuts off when key turned off.
Next step?
thanks
 
(quoted from post at 09:59:04 09/23/15) You've got me on the right track. The charging system does not charge and the light is on at startup. When #1 wire is jumped to alt. stud charging begins and lamp goes out. Charging continues throughout idle range but when tractor is turned off then restarted, system does not charge until jumped.
Wires are hooked as follows. Alt. stud to hot side of starter solenoid. #1 wire (R) to indicator lamp then from lamp to cool side of switch. #2 wire (F) to alt. stud.
If i'm understanding the problem is in the isolation circuit. Tractor shuts off when key turned off.
Next step?
thanks
amp too small and not providing enough excite current..try a little larger bulb or parallel the bulb with a 10 Ohm resistor. (GM used 10 Ohm, 6.25Watt resistor in parallel with bulb), 5 to 10 Watt should be fine.
 
Jmore beat me to it, but yeah.. your excite circuit is insufficient for the alt, and is fine for isolation the other way.

as said. you need more wattage.. either change lamp or scab on a resistor in parallel with the lamp
 
Thanks, I will try Napa switch. I want to use idiot light to keep me informed so i'll keep it hooked. Please excuse my electrical ignorance but if my excite current is not enough to begin alternator charging then how does the resistor help? I thought resistors reduced current and what is meant by wiring in parallel? Sorry to need it spelled out for me.
Thanks
 
(quoted from post at 10:51:47 09/24/15) Thanks, I will try Napa switch. I want to use idiot light to keep me informed so i'll keep it hooked. Please excuse my electrical ignorance but if my excite current is not enough to begin alternator charging then how does the resistor help? I thought resistors reduced current and what is meant by wiring in parallel? Sorry to need it spelled out for me.
Thanks
arallel or side by side. Bulb provides some current &amp; resistor provides some more, for a total that is sufficient to "excite". Two water hoses filling a bucket. :)
If you keep the idiot light, the AUX sw is of no value.......it is for use w/o any light, resistor or diode.
 
(quoted from post at 11:23:29 09/24/15) Does that mean the resistor goes in the same #1 wire that goes to idiot light from alternator?
esistor connects from one of the idiot light terminals/wires to the other idiot light terminal/wire. see lamp &amp; resistor circled in red.
 
(quoted from post at 20:51:47 09/24/15) Thanks, I will try Napa switch. I want to use idiot light to keep me informed so i'll keep it hooked. Please excuse my electrical ignorance but if my excite current is not enough to begin alternator charging then how does the resistor help? I thought resistors reduced current and what is meant by wiring in parallel? Sorry to need it spelled out for me.
Thanks

Then dump the useless amp meter and install a voltmeter...
 

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