Onan Generator Start due to no power in Technical Tips and Tricks Posted January 11 · Report reply 2 hours ago, oldjohnt said: HOWEVER if the solenoid has no S and I terminals but instead places the coil between the two small terminals and DOES NOT use the case as a conductor, if you apply 12 volts to the two small coil terminals the relay closes and if voltage is removed the relay opens. Since your present terminals are not marked for s & I, it would be my guess that you have what John is describing here. If the previous solenoid had S & I terminals then you probably should replace it with one of that type. 9 hours ago, WILDSIDE said: As I understand it, the solenoid is grounded to the frame at the bolting point. That is only true for solenoids that use the S & I terminals. If yours will engage by applying 12V across the two small terminals, that means that you don't have the S & I type of setup. If the solenoid uses a case ground then it should engage with +12V applied to the S terminal and the negative connected to the mounting case. If you use an ohm meter you can determine which you have because you will read a very low resistance between the two small terminals and open between either one and the case, if you have the type without any S & I terminals.