Skip to main content ↑ ↓
Topic: Boost switch Solenoid Location?? (Read 2179 times) previous topic - next topic

Boost switch Solenoid Location??

My Boost switch has never worked and I have never needed it, I would like to fix it just in case I need it someday...So I have a 1996 U270 and my question is where is the solenoid located so I can test, can anyone chime in with this info?? Thanks

Re: Boost switch Solenoid Location??

Reply #1 –
On my last three coaches it is located near the isolator. It is a silver squat metal device with two flanges for the screws to hold it to the back of where the bed or the closet entry is.  It has a couple lugs with bigger wires and a smaller one in the middle I think. I will have to look at it to be sure but I know what it looks like when I see it.

Re: Boost switch Solenoid Location??

Reply #2 –
Thanks..I start by looking around the bed area.. I know I have alot of stuff located under the foot of the bed like all my breakers/switch box

Re: Boost switch Solenoid Location??

Reply #3 –
Quote from: 96u270 –
My Boost switch has never worked and I have never needed it, I would like to fix it just in case I need it someday...So I have a 1996 U270 and my question is where is the solenoid located so I can test, can anyone chime in with this info?? Thanks

Here is what mine looks like. Located under the bed next to isolator.

How do you know it is not working?
Mine has a red light on the rocker switch that sometimes needs replacing but the boost switch is still working.

Re: Boost switch Solenoid Location??

Reply #4 –
Easy test of boost solenoid, Have someone in drivers seat turn it on and off while you listen near switch in rear.  You should hear it click. Also use a meter across lugs, should get no voltage reading until switch is engaged and then you should get battery voltage. Can also use 12v test light to test. If still no voltage across lugs, use test light on small wire lug and turn switch on and off, if no voltage here fault will be either at switch or a broken wire.
Gary B

Re: Boost switch Solenoid Location??

Reply #5 –
Barry, No light at switch, on or off, and no diff in dash voltage gage when switch is activated...
Gary,, I'll try the noise test tomorrow. If I can just located the solenoid I have a meter to test.. Thanks for the help

Re: Boost switch Solenoid Location??

Reply #6 –
If you have a voltmeter, go to the boost solenoid:

Check voltage at each of the two LARGE lugs with boost switch OFF.  They should be different and reflect the voltage of the two battery banks (one chassis, the other house). There should be no voltage to the small signal wire. If two small terminals/wires one will be ground, the other the signal wire from the boost switch.

Turn on the boost switch.  If the wiring, switch, etc are operating properly, the small sense wire should now have 12 VDC to it AND as suggested, you should hear the "CLICK" as the solenoid closes.  And, voltage at the two large terminals will be the same, since the job of the solenoid is to connect the two battery banks.

If, with the boost switch ON, there is not 12 VDC positive to the small signal wire, something "upstream" of the solenoid is at fault.  Easy to test the solenoid in this case.  With the positive signal wire off it's small terminal, use a small jumper wire (will carry less than one amp) between either large lug and the positive signal lug.  You should now here the solenoid click in and should read the same voltage on both large lugs.

Brett

Re: Boost switch Solenoid Location??

Reply #7 –
Makes sense.. Sounds like the way I used to jump start this old tractor my Grandpa used to have. Now if I can just find the solenoid..The picture Berry posted looks like something I have seen bolted to my frame behind the driver side rear tire...will look tomorrow

Re: Boost switch Solenoid Location??

Reply #8 –
This pretty much the way ours looks on a 99' U270... Except that Barry's engine compartment insulation looks much better than ours! Basically, just stand at the end of the bed, open the engine cover and look down into the engine bay and it is right in front of you on our coach.
Don

 
Quote from: Barry Beam –
Here is what mine looks like. Located under the bed next to isolator.

How do you know it is not working?
Mine has a red light on the rocker switch that sometimes needs replacing but the boost switch is still working.

Re: Boost switch Solenoid Location??

Reply #9 –
Should be petty easy to identify.  Will only be one solenoid in the coach that has both large lugs HOT but at different voltages.

Brett

Re: Boost switch Solenoid Location??

Reply #10 –
mine is located above the starting batteries, next to isolator.
rear compartment curb side.

Re: Boost switch Solenoid Location??

Reply #11 –
An easier way to test a solenoid is to plug in to 120 ac. The voltage of the house batteries should read around 13.2 volts. Measure the start battery, it should be around 12.6. Switch on the boost and measure the start battery again. If the solenoid is good, the voltage should climb to match the house batteries.

Re: Boost switch Solenoid Location??

Reply #12 –
96u270
Here is where mine is on another 96 U270...inside the door behind drive tires, driver side...the solenoid on the right, the one with the heavy cables.

Re: Boost switch Solenoid Location??

Reply #13 –
Quote from: Barry Beam –
Here is what mine looks like. Located under the bed next to isolator.

How do you know it is not working?
Mine has a red light on the rocker switch that sometimes needs replacing but the boost switch is still working.
             
Quote
So Barry, what is the process to change out the light? My light is out but I know the boost is working.
Here is how I do it.
Rocker Switch Bulb Replacement

Re: Boost switch Solenoid Location??

Reply #16 –
Thanks for all the help.. Thanks Ralph for the picture, that's got to be where it's hiding... And I'm going to check the light 2

Re: Boost switch Solenoid Location??

Reply #17 –
Well after looking at Ralph's picture again, I see two solenoids that look alike.. Is it the one on the left or right???

Re: Boost switch Solenoid Location??

Reply #18 –
Quote from: 96u270 –
Well after looking at Ralph's picture again, I see two solenoids that look alike.. Is it the one on the left or right???

The one on the right with the big cables. Check the previous posts on this topic for the newest Cole-Hersee model number or consider going to a solid state solenoid. 

Pierce

Re: Boost switch Solenoid Location??

Reply #19 –
I have just replaced the boost solenoid on my GV.  I had DW listen and she reported not only a click when I switched it on but also a hum from the coil holding the contacts closed.  I had to replace the single wire original unit with a two wire Cole Hersee 24213-BX, according to the box it came in.