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amp looking thing that runs the cabin blower motor
I have a 1995 Prevost H3-41 the blower motor will not turn on for the passenger air that blows through the whole bus. I was looking for a soleniod that runs that blower but there isn’t one instead there is a black box that has all the wires going to that the solenoid would. It looks like a amp or inverter but its not.. any ideas..Thanks.
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9 Replies
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One blower won’t turn off and one won’t turn on. Can you post a photo? Did you find the solenoid to stop the condenser fan motor? The evaporator fan motor solenoid was likely near it.
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on evaporator motor side. Square box about 8 inches by 3 inches thick (by memeory) usually mounted to rear wall of bay. is that it? Bob ps sort of has cooling fins like amp on it.
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Prevost has moved the relays for the OTR all around over the years. On my first coach the relays were in a box mounted on the ceiling in the first bay, driver’s side. On the next coach they were in a white plastic box in the condenser bay on the right rear wall.
Those were XL coaches. Wouldn’t want to even specilate where they might be on an H or other model years.
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Well logically then, open the black box that the wires go into, the solenoids should be there. My xl has a grey box. there is an old post showing a piicture of the box.
Look for a circuit breaker hidden on the exterior of the box, could be a hard press to reset.
Another “thing” could be your brushes are stuck away from the armateur, meaning not making contact. This can be caused by dampness and carbon dust.
I only know the situation on an 97 xl, yours should be somewhat similar.
Eventhough this appears to be an electrical problem for you, I think the moderator should move it to heating and airconditioning. just sayin.
JIM
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Yours would be nice. we do not need the combination to your safe! but area of country and first name . I have a extra speed control for the system. Amp looking thing. Ck see if you have power to it first.. If you do not feel comfortable with this : find a friend or pro that does to ck it out. Bob
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Here is the maintenance manual section for my 1997 shell h3-45.
Here is the maintenance page for your coach.
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The black box “amplifier-looking” item is an electronic variable speed controller, connected in the ground line to the evaporator fan motor. For some odd reason, it does not show up in most maintanence manuals because it was not used on the entertainer or seated bus units, only on certain years of motorhome shells. Attached is the Prevost wiring diagram covering the evaporator fan control.
On an XL, the dash fans speed potentiometer by the bus a/c main switch is what controls how much resistance to ground (resulting in how much voltage the motor “sees” overall to vary the speed). On an H-3, it appears to be controlled by the a/c logic module.
On an XL model, the unit can be bypassed in a pinch to allow the evaporator to run at full speed by bolting the two 2-gauge cables tightly and securely together and applying insulating tape, until you can obtain another one (providing that is, in fact the failed part).
On an H3, if the unit is bypassed, I believe the fan would run on high speed any time the ignition was turned on (which might not be the best avenue lol).Hope this helps.
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variable speed on my 98. I’m not using it. If the tempory fix works out let me know and it’s yours for shipping. XLE stands for 45 ft XL Entertainer. I’m converting to tripple slide for the two of us. Bob
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