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Old 05-21-2011, 11:17 AM   #11
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Re: New to me 2003 E450, looking for help!

Quote:
Originally Posted by opus
The master switch generally removes the ground.
On 24-volt front-end loaders, and on highway coaches (with the switch in the battery box), maybe yes. On the ambulances, vans, motorhomes, and fire rigs I've seen, in cases where the switch was accessible from the driver's seat, it usually breaks the hot instead. On any given vehicle it could go either way, depending on the beliefs or opinions of the person designing the wiring.

I've made a decent living tracing these systems out using a digital meter, and scribbling diagrams on a legal pad.
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Old 05-21-2011, 01:28 PM   #12
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Re: New to me 2003 E450, looking for help!

Yup, it cuts the hot on mine
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Old 05-21-2011, 04:12 PM   #13
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Re: New to me 2003 E450, looking for help!

Finished the hitch, now I am going to work on getting the trailer brake controller wired up
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Old 05-22-2011, 10:38 AM   #14
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Re: New to me 2003 E450, looking for help!

Depending who buiolt it, the A/C might be set up so that the DASH A/C will not work unless the REAR A/C is on. Several of the shuttles I drove were set up that way.
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Old 05-22-2011, 06:57 PM   #15
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Re: New to me 2003 E450, looking for help!

Quote:
Originally Posted by Jarlaxle
Depending who buiolt it, the A/C might be set up so that the DASH A/C will not work unless the REAR A/C is on. Several of the shuttles I drove were set up that way.

that is how mine is to. nice big "DO NOT OPERATE DASH AIR WITHOUT REAR AIR OR BLOW OFF MAY OCCUR" yet the rear wont do anything if the dash air is off.
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Old 06-26-2011, 10:40 AM   #16
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Re: New to me 2003 E450, looking for help!

Quote:
Originally Posted by Stuff
Quote:
Originally Posted by Jarlaxle
Depending who buiolt it, the A/C might be set up so that the DASH A/C will not work unless the REAR A/C is on. Several of the shuttles I drove were set up that way.

that is how mine is to. nice big "DO NOT OPERATE DASH AIR WITHOUT REAR AIR OR BLOW OFF MAY OCCUR" yet the rear wont do anything if the dash air is off.
These wouldn't hurt anything...you just didn't get any A/C from the front unless the rear A/C was on. Seems to be set up the opposite of yours.
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