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Old 07-15-2014, 07:42 PM   #1
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SMI brake system set up

So here is the scenario: Recently purchased a 2001 Airstream 30' Land Yacht, P30 Chassis. Included with the unit was a Roadmaster Sterling tow bar and SMI four wire brake system as well as a tow bracket. The MH is is set up with a G force 2 controller mounted at the drivers position. At the back of the coach is a standard tow hitch, a four wire trailer lighting plug, the square six pin plug for the SMI box and the screw in socket for the vacuum connection for the SMI brake box. I have not crawled end to end on the MH to track out the wiring.

Reading the information with the brake set up it appears that the vacuum connections would be on the TOWED vehicle rather than the coach. I called SMI and spoke to a person there who confirmed that but was otherwise not terribly helpful.

We recently purchased an 05 Honda Element (manual trans) to tow and a Roadmaster MX tow bracket. I hope to install the tow bracket this week and as for lighting will use a magnetic mount lights to plug into the trailer light. My concern is why would the vacuum connection be on the MH rather than the toad? I like the idea of being able to minimize electrical and vacuum connections on the toad so can I just run a vacuum line to the toad and plug in the SMI square connection and call it good?

Thoughts or concerns are appreciated.
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Old 07-21-2014, 06:48 PM   #2
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Go to the SMI web site .. There you will fine the complete manuals for all their systems and that should answer all your questions.

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Old 07-22-2014, 10:46 AM   #3
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I did spend significant time on the SMI web sight and also spoke to them on the phone. Finally have figured out that the PO had two separate systems installed that used many of the same appearing components. I have almost all of the components except those that were actually installed on PO toad. He passed on to me the SMI four wire system. I believe he kept another system, leaving only the coach installed components-thus my confusion.
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Old 08-02-2014, 12:07 AM   #4
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Quote:
Originally Posted by dateem View Post
So here is the scenario: Recently purchased a 2001 Airstream 30' Land Yacht, P30 Chassis. Included with the unit was a Roadmaster Sterling tow bar and SMI four wire brake system as well as a tow bracket. The MH is is set up with a G force 2 controller mounted at the drivers position. At the back of the coach is a standard tow hitch, a four wire trailer lighting plug, the square six pin plug for the SMI box and the screw in socket for the vacuum connection for the SMI brake box. I have not crawled end to end on the MH to track out the wiring.

Reading the information with the brake set up it appears that the vacuum connections would be on the TOWED vehicle rather than the coach. I called SMI and spoke to a person there who confirmed that but was otherwise not terribly helpful.

We recently purchased an 05 Honda Element (manual trans) to tow and a Roadmaster MX tow bracket. I hope to install the tow bracket this week and as for lighting will use a magnetic mount lights to plug into the trailer light. My concern is why would the vacuum connection be on the MH rather than the toad? I like the idea of being able to minimize electrical and vacuum connections on the toad so can I just run a vacuum line to the toad and plug in the SMI square connection and call it good?

Thoughts or concerns are appreciated.
I have the SMI stay-n play and the vacuum comes from the toad to the SMI box. Which model SMI do you have??
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