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2006 holiday rambler 40 PDQ endeavor


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Does anyone have the schematic for the trombetta delay start relay/solenoid.    I need to know if the board is sending power to the solenoid and what to verify the board to rule it out. Ty

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Put a voltmeter on the purple wire. (most likely).. Or just check both of the small terminals and also carefully feel the relay to see if it is warm or hot to the touch.

On the small terminals you should see 12.5 or so on one terminal and a ground on the other little terminal when it is being energized. You can also toggle the aux start button to see the same but temporary results as the button is held on.

Even if this tests finds voltage controlling the relay and you can even hear it clunk when being energized does not mean it is in working condition. The contacts are simply physical contacts that get pitted and the relay is a very common failure item. Some can be easily overhauled but if it is the one about the size of a large fist then just changing it out with a new on should be done just for good maintenance practices.

The relay can easily close on a good section of its contacts one time and then next time it will not. You risk dead and damaged batteries for sure if you do not fix the problem quickly.

This should get you started. If you really do need schematics I have some that should apply. It is a very simple system for the most part.

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There are two basic components (sometimes three).  One is the Solenoid itself.  It is usually a Big Boy, if it's use in conjunction with an IRD (Isolator Relay Delay) or BIRD (Bi-directional IRD).  If it is used only for Battery Boost, then it is usually a trombetta.  The second is the IRD, often an Intellitec Isolator Relay Delay Part Number 00-00629-120.  This device monitors the chassis battery voltage and sends the "trigger" voltage to the Big Boy when the chassis battery is above 13.2 volts (i.e., the alternator is charging the battery).  It also disconnects the batteries when the voltage drops.  The third device, not present on all units, is a Isolator Defeat Relay.  The purpose of this relay is to defeat (not allow) the Big Boy to connect the battery banks together when the Generator is running.  This eliminate the False "ALT-FAIL" indication received sometimes when the alternator and generator are both attempting to charge the chassis battery.  

I'm not sure which wiring diagram you are looking for.  There is none that I am aware of for the guts of the Intellitec IRD - that is propriety information.  Are you looking for how the IRD is connected to the Big Boy?  

Intellitec has a service manual with troubleshooting tips here.

If you can be more specific, I may be able to help with wiring diagrams that show interconnections.

  -Rick N.

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5 hours ago, eyeball said:

Does anyone have the schematic for the trombetta delay start relay/solenoid.    I need to know if the board is sending power to the solenoid and what to verify the board to rule it out. Ty

In downloads is the 2006 Endeavor/ Diplomat wiring schematics.

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Well after a few more things  don't have 12v between red and black isolator delay circuit board,even when trying the battery boost switch. There is 12v on the blue wire though wonder why.  The 5 amp fuse is good no 12v at purple & white wire on solenoid switch.       Is there a breaker feeding the circuit board.    If board is bad where would I get a direct replacement.     Thanks all

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