CHECK YOUR BATTERY SYSTEM THROUGH YOUR CIG. LIGHTER

DEBUG YOUR GMC CHARGING SYSTEM

THROUGH YOUR CIGARETTE LIGHTER SOCKET

( CLICK ON PICTURES TO ENLARGE THEM)

DON'T UNDERSTAND ELECTRICAL ?

DON'T UNDERSTAND THE GMC BATTERY SYSTEMS ?

HERE IS THE PLACE TO START
(click on pictures to enlarge)

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FOUND BY 

Orders David

I have 2 of these and keep one plugged into the dash socket of the GMC. Shows battery status when the motor is off and charging status when running. Inexpensive and has a large, easy to read back lit display that also pivots for best viewing angle. $15 at Amazon.

http://www.amazon.com/gp/product/B000EVWDU0/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1

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- free shipping through Walmart

- buy the test leads also

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TEST FROM YOUR CIG. LIGHTER

- battery quality
- alternator

- boost switch

- engine battery

- house battery

- house charger

- isolator

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#1 FIRST THING TO DO IS
TURN EVERYTHING OFF
CHART BY KENB
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BATTERY QUALITY

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ALTERNATOR CHECK

* turn all systems off for over night

(see above)

* plug in the meter to the cig. lighter socket

* measure the starting battery (12.58 volts or so)

* start the engine

* look at the voltage (13.65 or so)

*the alternator is good and putting out (14.7 volts or so)

*no change in voltage - problem with alternator)

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click here to see flow chart

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BOOST RELAY CHECK

CONNECTS ENGINE BATTERY  TO HOUSE BATTERY

* turn all systems off for over night

(see above - LETS GET STARTED)

* plug in the meter to the cig. lighter socket

* measure the starting battery (12.58 volts or so)
* press the boost switch 
* you should hear it click
* voltage measured will change 
  - go down if house battery is low
  - will go up if house charger is on
* you know
  - the boost switch is controlling the boost relay

  - if no change - boost relay is not working
  - 

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CHECK YOUR HOUSE CHARGER

* DO YOU HAVE A HOUSE CHARGER

* IS IT A BUZZ BOX

* WHAT IS A  BUZZ BOX

* IS IT CHARGING ALL YOUR BATTERY BANKS

* WHAT VOLTAGE IS IT CHARGING

* #! TURN EVERYTHING OFF- (over night)

* UNPLUG THE GMC ( TURNS OFF THE CHARGER)

*  READ METER - JOT DOWN THE ENGINE BATTERY VOLTAGE

* PUSH THE "BOOST" SWITCH TO READ THE HOUSE AND ENGINE BATTERY VOLTAGE

* PLUG IN THE GMC

* THE VOLTAGE SHOULD CLIMB TO THE "CHARGER VOLTAGE" (about 13.25 volts)

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SEE THE WHOLE FLOW CHART HERE

link
http://www.gmcmhphotos.com/photos/data/15/GMC_charging_system_checkout.pdf
BY
KEN BURTON

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MORE TO COME EVERY DAY