Power for the VMSpc Box

I just read from another forum that the VMSpc box was powered from the chassis. I had assumed that it was powered from the computer. Since my chassis connector is in a location rather difficult to get to I prefer to leave the VMSpc cable plugged in. So where does the power for the box come from? How much power or current does it use? Would it hurt to leave it on virtually all the time? Thanks.

Answered My Own Question

Things move fast on the internet. I found that my VMSpc box is powered by the chassis connection and is on only when the ignition is on. I have a 2000 XCS Freightliner chassis. The info I got earlier is from a person who owns a 2000 Monaco Diplomat with a chassis designed and manufactured by Monaco. He seems to know what he is talking about and he says that his VMSpc box is on with the ignition off and he is worried about draining the chassis battery. Assuming his MH is operating normally, the difference is in chassis manufacturers. I am glad my VMSpc turns off with the ignition!!

Jim Walker
Northern Virginia

Power for the VMSpc Box

I have a 2001 Monaco Diplomat, and the VMSpc is powered by the chassis battery, and is always on regardless of the ignition key position. I plan on adding a switch so I can turn it off when I put the coach in storage.

Rex 01 Diplomat

Re:Power for the VMSpc Box

The VMSpc JIB "pulls" about 100 mAmps, or 1/10 of an Amp. For short periods of time (Like Days) it should be fine to leave it on. Luckily most Coaches have something most Passenger Vehicles don't have, a Spare set of Batteries.

When the VMSpc (and ALL the other VMS's) were designed, 90 some Percent of Chassis Manufactures had and have a Switched Diagnostic Port. We have found some 2006 and 2007 Country Coach Inspires with an "Always On" Diagnostic Port (something we have never seen before), I had a talk with one of the "engineers" about that, and he stated that was "unintentional", and the Diagnostic Port should be Switched on the Ignition.

Mark Overholser

===================================================================
Mark D. Overholser
Engineering Technician
SilverLeaf Electronics Inc.
2472 Ferry Street SW
Albany, OR 97322

888-741-0259
541-967-8111
541-967-8988 (fax)
http://www.silverleafelectronics.com/
( http://www.simply-smarter.com/ )
===================================================================

More on VMSpc Power Use

Hey Jim, Rex and Mark. Interesting comments about the "always on" diagnostic port. This is how my '00 Monaco Diplomat works also. There's a rocker switch on the dash of my coach labeled, "Engine Diagnostic." I always wondered what this was for. I don't believe it's documented in my users manual. Anyway, maybe this toggles the EMS feed to the diagnostic plug on and off? I'll try it tonight and post my findings here.

Gaines Hillix
2000 Monaco Diplomat 38D
8.3L 315hp Cummins ISC

Engine Diagnostic Switch

Gaines
My Freightliner chassis has a "Check Engine" switch under the dash that I have never used. I called Freightliner to find out what the switch did and they said it was to send engine codes to code reading equipment available to dealers. My rocker switch appears to be a momentary switch. I will get around to checking to see if VMSpc can pick up codes from the switch. In any case my switch doesn't affect whether the VMSpc box is powered or not.

Jim Walker
Northern Virginia

Power for the VMSpc Box

I had a 2000 Diplomat when I first got my VMSpc. I just cut the power wire in the cable and put a switch in... then turned the switch off when not using the coach. It worked fine for years. Now I have an '03 Dynasty and, although the same manufacturer, power goes off from the connector when the ignition switch is in the off position.

I forget how I determined which wire to cut... think I found info in the manual.

Re:Power for the VMSpc Box

Glad to hear that Monaco made the diagnostic Plug, Switched...

SilverLeaf recommends the Power Wire be cut and a switch be added there (Check your Wiring Harness for indication of which wire is Power, your Colors will vary)

Mark Overholser

===================================================================
Mark D. Overholser
Engineering Technician
SilverLeaf Electronics Inc.
2472 Ferry Street SW
Albany, OR 97322

888-741-0259
541-967-8111
541-967-8988 (fax)
http://www.silverleafelectronics.com/
( http://www.simply-smarter.com/ )
===================================================================

Installing A Switch

"I forget how I determined which wire to cut... think I found info in the manual."

I don't find the info in the manual, but disconnecting the plug at the JIB would easily allow you to find the 12V pin-wire. In my case it is the red wire.

Jim Walker
Northern Virginia

Re:Installing A Switch

You have one of the latest Harnesses. The Older Ones were a Blue Wire for Power. The Really Old ones were Black or White If
I Recall Correctly (IIRC).

On the Current VMSpc JIB (The ones with Both Connectors on the Same Side of the Box) the Power is at Pin #7, which when looking at the Wire Side of the 12 Pin Molex Connector is Top Row, Far Right, when the Locking Tab is Up. (See Page #5 in VMS 200 Installation Manual) We try to keep the Pin Outs as similar as possible.

Mark Overholser

===================================================================
Mark D. Overholser
Engineering Technician
SilverLeaf Electronics Inc.
2472 Ferry Street SW
Albany, OR 97322

888-741-0259
541-967-8111
541-967-8988 (fax)
http://www.silverleafelectronics.com/
( http://www.simply-smarter.com/ )
===================================================================

Monaco Wiring

FYI... Monaco has not changed all their units to a "Switched" plug. I just hooked up my new VSMpc system to my '05 Knight (Cummins ISC 330) and the JIB is powered all the time. I'll be installing a switch, probably one with an LED inticator to show when the syhstem is powered up.

Power On

My 99 Discovery ISB has the power on all the time.
I installed the VMSpc in Oct. 2002 and it has been on 24/7 since. I full time so no problem of batteries being run down.

Will that be a problem of shorting the life of the VMSpc box?

Larry

Don't worry about the box.

Being on all the time won't affect the longevity of the JIB. The JIB should outlive your coach either way.