After replacing the bad isolator with a Sure Power 120 amp isolator from PPL Motorhomes I continued with my cable checking/cleaning. After IDing the wires on the boost solenoid I put them back on and tried to tighten the nut. I noticed that the nut would start by hand but become hard to turn after a couple of turns. I went ahead and tried to tighten it but it completely stripped the threads on the copper post. I've taken the solenoid off and tried to find some information on it but the only thing on there is a stamp that says 12V. I found the post listing a Cole Hersee 200 amp relay as a replacement but I'm wondering if I need one that heavy plus I would like to find a three terminal one so I do not have to add a ground wire.
That is the best you can do - I put one on mine last year.
Quote from John Cooper: "I found the post listing a Cole Hersee 200 amp relay as a replacement but I'm wondering if I need one that heavy plus I would like to find a three terminal one so I do not have to add a ground wire."
John,
A 125 amp, continuous duty, 3 pole solenoid will work just fine for the boost solenoid. I keep a couple as backups, but have not yet (in 8 years) had to replace the boost solenoid. I have, however, had to replace the dash solenoid (200 amp Cole-Hersee) three times. I finally changed to an electronic switch (recommended by Brett Wolfe) for the dash.
Make sure it is "continuous duty". I made that mistake once.