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Topic: Boost switch Solenoid Location?? (Read 2179 times) previous topic - next topic

Re: Boost switch Solenoid Location??

Reply #20 –
Update...I replaced the light in the rocker switch and bingo the light works in the on position.
Next I parked next to a wall and opened the driver window and I could hear the thing ''Click'' when I turned the switch on and off.Now I used my voltmeter and with it on one side I got 12 volts and the other side I only saw 6 to 7 volts so I'm thinking the solenoid is junk..

Re: Boost switch Solenoid Location??

Reply #21 –
If you truly measured 6-7 VDC on one of the large lugs of the boost solenoid, you either have dead batteries on that bank OR bad connection somewhere.

Again, each large lug should have EXACTLY the same voltage measured at the battery bank it is connected to.

Brett

Re: Boost switch Solenoid Location??

Reply #22 –
OK,,Tomorrow I will pull and clean connections

Re: Boost switch Solenoid Location??

Reply #23 –
And I did check all batteries and all are good

Re: Boost switch Solenoid Location??

Reply #24 –
As Brett said, with that big of a voltage difference, you got the have a bad connection or cable. A little hint unhook the cable with the low voltage at the solenoid then check the voltage, just keep going back on that cable until you find the problem connection/cable. More that likely you will find the problem where the terminals are crimped on the cables, they can look good but be corroded on the inside. On coaches of older vintage these kind of problems are common given the age of the battery cables. Be careful working with metal tools around those heavy cables they carry a lot of amps.  Happy hunting.

Re: Boost switch Solenoid Location??

Reply #25 –
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   
 

Re: Boost switch Solenoid Location??

Reply #26 –
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