Good Day: About a year old. OK, let's think it worked correctly at one time. This makes it easy. If it never worked you have to check a lot. Look inside at the regulator: is it black TRC or green Libby? What's happening, is as the engine goes over 900 RPM and you hold the start switch in start and K15 closes, you place a B+ in the field of the main gen, and it wants to make AC Voltage. In the 60Hz S12 Position which the schematics are drawn in an AC Sense is passing from L1 thru the voltage adjust on the front panel and thru the R16 to the regulator to set the AC output. At the same time an AC sense is picked up from behind the reconnect board from L1 and L3 and applied to the TR1 transformer and this is stepped down and applied to the regulator to allow the regulator to pass a trapezoidal wave form to the Main gen field so it makes an AC Voltage taking over as you let the s1 go to the run position. It sets how much firls is required every 1/100th of a second says the engineers.
One of those above circuits is no longer functioning. Either L1 thru Volt ADJ and r16 is busted or the AC to the transformer or transformer is busted. The only other item is a 3A fuse located beside the regulator in the control box if the ECP was applied to your generator. Do the following: Check the 3 A fuse, if good go on and if bad till you get one the next day unplug the wire from the regulator and connect it beside the other on the bottom where the extra tang is located; take a meter set to read ohms, and with everything off, one lead on L1 of the main Contactor and the other on terminal 5 of the regulator. It works best if you remove wire 137A and measure the wire. Should be able to rotate the V-ADJ and see it working on your meter. If good go on, if not TS that circuit: Replace the wire, and now with a flashlight look at T1 transformer in the back of the reconnect box. If it has dark brown snot dripping out of it, you got the issue and now just replace with Libby or TRC compatible components which ever applied to the regulator and you are in business.
Let us know how it goes.
