MCI 9 24 volt?

[johns4104s]

Is all the wiring and solenoids 24 volt? Like the wire back to the high idle?

Thanks

John

[JackConrad]

Is all the wiring and solenoids 24 volt? Like the wire back to the high idle?
Thanks
John

From the factory YES. From the last owner ??.  Most likely, all fast idle wring is still 24 volt simce the fast idle soplenoid is a 24 volt solenoid.   The only 12 volt wiring, from the factory, that I can recall is a center tap from the batteries to the front panel for a 12 volt radio.

[gumpy]

Yes. The only 12 volt things are the blower cut in relay in the RJB, headlight bulbs, and some miscellaneous for passenger comfort that usually gets stripped out.

High idle and engine stop solenoids are 24v.

[johns4104s]

Thank You.

So were did you guys conect to to get to access 12 volts?

John

[bevans6]

My MCI-5C has a stock Vanner mounted right beside the main battery switch in the forward luggage bay, a 30 amp fuse at the top right hand side of the battery bay, and 12 VDC present on pin 6 in the AC electrical panel and pin 55 in the main front electrical panel.  That's what I was trouble-shooting today, so I have it all handy...  You could start by looking in the bay to see if you have a Vanner.  If you don't either plan to get one or keep any 12 VDC loads that you run from the start batteries quite low. 

I plan to run the power seats, dash radio, two dash-top fans from that 12VCD feed.  All the house stuff will be run from a typical 12 VDC house system with separate batteries, converter, etc.

Brian

[johns4104s]

can you just take the starting batteries that are connected in series(24v) and come off one of them to get 12 volts? I would put a fuse in. But is this the correct way to pull 12Volt?

Thanks

John

[Dallas]

John, As far as I know, if the Vanner is set up at factory spec, it only equalizes loads between the batteries, allowing the batteries to be charged equally. If that is the case, then you would hook your +12V to the forward positive battery terminal and the -12V to the forward negative battery terminal.

I just asked a question in another thread about checking Vanners.

Dallas

[bevans6]

You can do it and it will work, but it's not  correct.  You would tap off the "bottom" battery, the one that is connected to chassis ground.  The reason it's incorrect is that the load on the  batteries becomes unbalanced and that causes one to charge more than the other.  One battery basically gets discharged, and the other gets over charged.  That leads to premature battery failure.

The Vanner is a battery equalizer.  It allows the two batterys to keep equal charging states when you draw off the 12 volts from the bottom battery (bottom from a schematic drawing sense, not necessarily the bottom battery in your battery drawer).  Information on Vanner battery equalizers is here: http://www.vanner.com/client/images/manual_Battery_Equalizer.pdf

The different models let you draw different amounts of current, and keep the batterys at different degrees of equalization while doing so.  I have a 60-50E.

Hope this helps.

Brian

[gumpy]

John,

There should be a tap between the two batteries. It should have a circuit breaker in the line, and should go to the a/c junction box in the front driver's side bay. From there, it goes to the front junction box. Check your wire list in your manual. There's a stud in the front j box that should have 12 volts on it. I don't know which one off the top of my head and I'm too lazy to drag my butt downstairs and look it up  (If you don't find it, let me know and I'll do the drag thing...)

craig

[busshawg]

I had one terminal in my electrical box beside the driver's seat that is 12V. You would access it from the outside. I can't remeber the terminal number but it is loacted near the bottom right side. Just turn you power on and do a voltage check on each terminal. I can let you know which terminal it is tomorrow. The PO had a sterio and CB hooked up to it. I have my 12V air dryer , sterio, cig lighter, and CB hooked to it.
I'm sure the PO center tapped the battery to get this 12V source so if you find one be sure to use an in line fuse for what ever you hook up.