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Wiring of major tech VB12APS distribution board ?

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Contact Major Tech to request a wiring diagram.

Posted on May 13, 2017


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Posted on Jan 02, 2017


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Why is my 2004 crown victoria completely dead wont start interior lights wont come on new battery installed need help please

Do you know how to test automotive electrical circuit's using a DMM - digital multi-meter , following a electrical distribution diagram ? Testing power an ground circuits ? If not ,your best bet would be to take it to a qualified repair shop . Or learn how to diagnose automotive electrical circuit's . Free wiring diagrams here Enter vehicle info. year , make , model , an engine size . Under system click on electrical distribution ,then under subsystem click on power distribution . Click the search button ,then the blue link's . Follow power flow ,heavy gage wires to fuse boxes ,test with voltmeter .
Electric Testing Techniques You Need to Know
Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts

Nov 05, 2017 | Cars & Trucks

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Is it east to replace the wire that is leaving the alternator on a hyundai santa fe 2002 2.4 engine 2 wheel drive

Hello Michael Thompson,

It is not rocket science... BUT that is a CRITICAL power
path ... precisely engineered.. (big capacity).

Never attempt ANYTHING with the battery connected...
Ground comes off FIRST... and goes back... LAST.

I ordinarily encourage doing-it-yourself...
but that wire... and your battery & major ground circuits
can cause MAJOR (life threatening) PROBLEMS if done incorrectly

A shabby connection on that path (in particular) can cause a fire and damage your power distribution (in transit).

If you have MORE than a PASSING knowledge of wire-sizes, soldering, heat-shrink, un-wrap... re-wrap... naaah.

Take a look at your dealer or to see if
the entire wire can be purchased...

Or even a SALVAGE YARD...

ELSE ...

RockAuto Parts Catalog

Aug 06, 2016 | Hyundai Cars & Trucks

1 Answer

Sudden loss of power

Are you sure the battery is being drained during this process? That would be a major draw from something, but then you said "...suddenly full power again,". It sounds more like a connection or a terminal working loose at times, not able to pass normal voltage. You sure need a voltmeter, my friend.

I think I would want to have that new alternator tested again, just to make sure it is not defective. A lot of aftermarket parts are turning up like that. Did you replace the alternator and battery because this condition was present? Do you know your battery cables and ground points are all good and secure, and corrosion free? You might want to double check all the grounds you can find- the battery negative cable, the engine to body strap, or cable, maybe an engine and computer harness ground point-look around the top of the engine for a ground wire coming out of the engine wire harness and going to ground at a nearby bolt. Also check all alternator connections.

If you have to keep looking, look at the power side of the power distribution scheme. From the battery, power goes to the Power Distribution Center, maybe called a junction box or junction is where the fuse and relay block under the hood receives power, both from the battery and the tie-in from the alternator, and then distributes it to the major circuits for the car. With all your symptoms, it sounds like the problem is not far from the battery in the power distribution. Sayeth Dr. monte. Good luck.

Sep 14, 2014 | 1994 Hyundai Excel

1 Answer

I have a1997 saturn sl, it start and shut off by itself. someone said it might be the sensor problem. sometimes engine light comes on but oes by itself

havit scanned today -----hav u done a major tuneup--throttle body and idle air cleanin--check egr valve and catalytic converter--new plug wires and distributer cap--------these dont show up on a scan----vacuum leaks dont show as codes either

Sep 22, 2011 | Saturn S-Series Cars & Trucks

1 Answer

1988 mercedes benz 300ce when i start up sometimes it cuts off although ive had a major tune up and new muffler an sometime when i put it in reverse it cuts off o me then i have to start it up again and...

Not sure whats been replaced in your major tune up but cap rotor coil wires and OVP are the biggest culprits. After that the fuel distributer and duty cycle.

Aug 10, 2010 | 1988 Mercedes-Benz 300

1 Answer

Motor turns but not starting

Try some simple things first like, checking to see if you have enough fuel, fuses and relays.
If you have the correct tool, you can remove the fuel line to see if the fuel pump is pushing fuel when you turn on the ignition. One major find in my travels is, the coil lead wire going to the distributer may have dislodged. On 5.7 litre engines this lead wire is in the front, unscrew the air flow pipes to get better access. Good luck.

Nov 17, 2009 | 1994 Chevrolet Camaro

3 Answers

1993 Ford Festiva: No power at fuel pump relay.

in engine bay near battery there is a power relay that is probably the issue.


Oct 21, 2009 | 1991 Ford Festiva

4 Answers

Knocking/pinging sound when stepping on the gas for power.

you will distroy the engine if you continue to let this noise happen.
the timing must be retarded to get the ping out if its that bad.
most of the time if its just a little bit though filling the tank with super unleaded will take out the noise.
the distributer must be loosend and turned in the correct way to ****** the timing and the idle must be put back up to compensate.
the distributer is the ignition timing.
the other thing that could have happend is the timing may have jumped time on the timing belt itself.this is a complely different timing.
this timing is valve timing.
the distributer is ignition timing.
when the distributer is turned you are changing the ignition timing .
you say in your text and i quote .

The service tech only adjusted the distributor fas far as he could to lower the idle.

a tech should never be turning the distributer to lower the idle nor should this be explained in any way to the customer.

if a tech says he dosent understand something stop them rightaway and get your car out of there or get someone else to talk to .
10 times out of 10 if the tech dosnet get it the car wont get it either.
have a competent service tech test and conferm the timing belt or chain timing .

keep me posted

thank you

Jul 29, 2009 | 1995 Nissan Pathfinder

1 Answer

My 2000 gmc van misfires in rainy weather then clears up.

Check the inside of your distributer cap, moisture will cause major problems. Start your jimmy and run water over and around your distributer, after awhile turn it off remove the cap and feel the inside for might not be sealing right.

Dec 27, 2008 | 1994 GMC Jimmy

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