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Old June 26th, 2007, 09:28 PM   #1
Mulder
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Default Mulder Jeep (Electrical System Re design)

So, being an electrical engineer I decided that the Jeep really needs some cool gadgets. At work I am responsible for the design work on our multiplexed chassis. In case you’re wondering multiplexing is a fancy way of remotely supplying power to loads. The benefit of it is that instead of relay logic I can use micro controllers to trigger high power mosfet transistors.

In the picture below you will see the display module, this LCD screen will allow me to program in buttons to supply power to items like, headlights, compressor clutch, starter solenoid, and so forth all based on my designed logic. It has three video inputs that I plan to wire to cameras and a GPS system. I plan to use the lower legend buttons as menu switches for diagnostics and other menus. I also plan to monitor items like TPS, MAP, all temperatures and others.

Currently I have all the hardware mounted on my Jeep and the schematics drawn on paper. Soon I will start building the wire harness and testing my circuits. I’ll continue to post pictures along the way.

Wish me luck!!!

Current Stats:

92 YJ 4.0L
SOA on 1" Leafs, 1" Shackles, 1" Body lift
Ford 8.8 with mini spool Rear, Dana 30 Up front soon to be welded
35" 12.5 Mud Kings
60 mm Bored Throttle Body
(Working on 4.6L Stroker = got parts)
(Multiplexed Electrical system = Work in progress)
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Last edited by Mulder; June 27th, 2007 at 08:38 PM.
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Old June 26th, 2007, 10:43 PM   #2
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sweet....I was going to go to school for electrical eng stuff. Look luck on your project.
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Old June 27th, 2007, 06:28 AM   #3
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Wow, and I thought wiring my jeep was a mess

I hope this works out for you, because that would be great.
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Old June 27th, 2007, 07:17 AM   #4
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Sounds sweet... I would fry it the first time out
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Old June 27th, 2007, 11:15 AM   #5
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One of the main reasons that I am doing this is to prevent frying my electrical system again. I've driven in all sorts of crap and have seen tons of issues due to corrosion. I've hacked and tapped my current wire harness way too much to attempt any water crossing, or even driving in the rain!

Now my Jeep will have nothing but water proof electrical connections made for firetrucks.

I just happen to have close relationships with all my electrical component suppliers here at work and am getting the unofficial hook up.
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Old June 27th, 2007, 11:30 AM   #6
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Is the computer thingy on the dash waterproof though... that's what I meant :tonka:
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Old June 27th, 2007, 08:37 PM   #7
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Its weather resistant, circuit board is coated in epoxy, and buttons are made of silicon with an inductive pickup. I still wouldn't say its submursable. But I've seen them stand up to light water spray.
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Old June 27th, 2007, 08:57 PM   #8
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by waterproof electrical concetions for fire trucks do you mean heat shrink conectons???/ I am an electrical apprnetice and I do not know what you mean by this.
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Old June 27th, 2007, 09:37 PM   #9
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One doo dad geek to another.....Dat der looks cool.
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Old June 28th, 2007, 09:35 PM   #10
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Quote:
Originally Posted by samuraijunkie View Post
by waterproof electrical concetions for fire trucks do you mean heat shrink conectons???/ I am an electrical apprnetice and I do not know what you mean by this.
I think he means connectors like amphenol connectors which are mucho dinero but seal the connection from most weather....Their military grade connectors are Niiiiiiiice.
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Old June 28th, 2007, 10:12 PM   #11
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Quote:
Originally Posted by Kawierider View Post
I think he means connectors like amphenol connectors which are mucho dinero but seal the connection from most weather....Their military grade connectors are Niiiiiiiice.
I heart amphenol connectors.

The ones that we uwe at work are pretty bulky though...









Sweet project!

Can't wait to see the updates!!!
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Old June 28th, 2007, 11:17 PM   #12
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Sweet project.

What do you think of the mini spool? I know it would be great offroad but what do you think about the street?
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Old June 29th, 2007, 10:11 AM   #13
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Deutsch is our connector supplier that I plan to use, most of the connectors are rated to be submursable.

The spool is nice, tires are nice and chirpy!!! Its not my daily driver so I don't mind.
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Old June 29th, 2007, 10:12 AM   #14
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Also

I can proram custom graphics in to my display anyone got some good Jeep jpegs that I can use as icons?
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Old February 8th, 2008, 12:32 PM   #15
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Update

I finished my dash harness and painted the dash itself.

See attached pictures
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Old February 11th, 2008, 04:27 PM   #16
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What is the cost of this build?

Your cost and my cost if you dont mind sharing.
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Old February 11th, 2008, 04:28 PM   #17
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yea, let's see you put a price on this one!!
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Old February 12th, 2008, 11:48 AM   #18
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Wow, my costs are as follows:

Dual Optima Batteries : ~$200
Dual Battery tray: ~$100
HeaterCraft Heater: ~$150
Engine Fan: ~$40
Reverse lights: ~$15
Fog Lights: ~$20
Brake Lights: ~$20


Multiplex Display: Free
Multiplex nodes x 3: Free
Wire: Free
Connectors: Free
Terminals: Free
Power and Ground Studs: ~$20
Solenoids: ~$40
Old Laptop: Free
Software: Free


Your estimated costs would be around $5000, however the multiplexed control nodes are not sold to te general public yet. I hope I didn't scare you off.
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Old February 12th, 2008, 12:05 PM   #19
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What is the original application for those parts?
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Old February 12th, 2008, 10:13 PM   #20
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Emergency vehicles: Fire Apparatus, Ambulances
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