Foretravel Owners' Forum For owners and Fans of Foretravel Motorcoaches September 10, 2025 ...

Re: Boost switch Solenoid Location??

Reply #25 – May 19, 2012, 11:36:06 pm

Well on Friday I pulled and cleaned ''Sand Paper'' all cable connections on my coach,Batteries,isolator board,alternator....Also replaced the Boost Solenoid.
After all this I checked the voltage at the two post on the boost solenoid, house side showed low 13 volts, engine side high end of 13 volts..Now when I hit the boost switch I hear nothing and the Voltage never connects,I checked the Sig wire and I do have 12 volts when Boost switch is on...I Picked the Solenoid up from NAPA, I took my old one and he matched it up,The ticket calls it a 12 volt starter solenoid....I'm thinking Its bad or I have the wrong kind,At least my old one made a click when I hit the boost switch   

Quote Selected

Re: Boost switch Solenoid Location??

Reply #26 – May 20, 2012, 08:48:27 am

No, he did not match it up correctly, though it should have worked for your test.

A starter solenoid is INTERMITTANT DUTY.

A boost solenoid needs to be a CONSTANT DUTY SOLENOID.

Some solenoids have one small terminal (which would be the 12 VDC positive signal from the boost switch). Ground is through the solenoid body screwed to a good metal contact.

Some solenoids have two small terminals, with one being the signal terminal and the other is the ground terminal.

The one and two small terminals units are interchangeable, as long as it is a constant duty solenoid.

Brett

Quote Selected