Question about 2003 Chevrolet Suburban

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Short running battery down

Tbc 2b fuse shows a short when tested with a volt meter

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Do an ohm check to ground at the fuse with the positive cable disconnected. If you read close to 0 then yes you have a short. If it's above ~10 ohms (it actually may be quite a bit higher) it's going through a load. See if you can follow the wiring and shake it if you have a short to see if you get a jump in resistance. If you know where it goes, find the other end before it goes through the load and shake it on that end. Looks like other people have been having this issue if you are referring to a battery drain issue:


http://www.gmtruckclub.com/forum/showthread.php/96295-Electrical-problem-battery-drain-How-much-is-too-much

Posted on Mar 30, 2014

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Posted on Jan 02, 2017

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2006 Chevy express 2500 instrument panel lights stopped working after two wires touched going to tow switch. No blown fuses


Which I/P lights ? Instrument cluster , radio , HVAC control panel etc.... All the I/P light's are controlled by the BCM - body control module . Do you know about electronic control modules ?
DTC B2610 Passenger Compartment Dimming 1 Circuit
The body control module (BCM) receives a variable voltage signal from the instrument panel (I/P) dimmer switch requesting to illuminate the instrument panel controls illumination lamps to a desired intensity. When this occurs, the BCM directly sends a variable voltage based on the I/P dimmer switch position on the backlight lamps control circuit, instrument panel lamps dimming control circuit, and the LED dimming signal circuit.
Voltage for the backlight lamps control circuit, instrument panel lamps dimming control circuit, and the LED dimming signal circuits is from the TBC 3 fuse 16 in the underhood fuse block directly through the BCM to these circuits.

• Perform a visual inspection for loose or poor connections at all related components. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
• A short to ground in the following circuits will cause the TBC 3 fuse to open:
- The backlight lamps control
- The instrument panel lamps dimming control
- The LED dimming signal
- Battery positive voltage from the underhood fuse block TBC 3 fuse
• An open in the TBC 3 fuse will cause the BCM to set the following DTC:
- B0951
- B2610
- B2625

DTC B2615 Passenger Compartment Dimming 2 Circuit
DTC B2620 Display Dimming Pulse Width Modulation (PWM) Input Circuit
DTC B2625 Display Dimming Pulse Width Modulation (PWM) Output Circuit
Do you know how to Test for a high resistance, an open, a short to ground, or a short to voltage in the following circuits. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
• 5-volt reference
• The dimming input
• The dimming return

Tow/Haul mode enables the operator to achieve enhanced shift performance when towing or hauling a load. When tow/haul mode is selected, the tow/haul switch input signal to the body control module (BCM) is momentarily toggled to zero volts. This signals the powertrain control module (PCM) or transmission control module (TCM) to extend the length of time between upshifts and increase transmission line pressure. Cycling the tow/haul switch again disables tow/haul mode and returns the transmission to a normal shift pattern.

After reading all the pertinent info. to your problem, doing testing ,Checking for DTC'S -diagnostic trouble codes in the BCM , checking power and ground's for the BCM an checking voltage at the tow / haul switch to and from the BCM .is where i would start . Do you know how to do electrical testing ? Read a wire diagram ? If not there are videos on youtube for learning how to do basic automotive electrical testing , how to read wiring diagrams etc... You can find free wiring diagrams at
http://www.bbbind.com/free_tsb.html The only thing with this is you don't have info. saying where componet location's are . This is were factory service info would be helpful

Jan 04, 2017 | Cars & Trucks

1 Answer

Battery boil over


Hi Kelly Ann-
Curious: Does your car's starter work?
I've heard where a bad starter can develop a slight short which will draw down the power stored in your battery. They can test this using a volt meter. If your car is shut off, and no accessories are on (like headlights) there should be no draw from your battery and charging system so the volt meter should show no connectivity (current). If there is a short (somewhere), the meter will show connectivity/current running. With the car not running, the alternator can not charge your battery and eventually the battery will die out. Ask the shop how they determined it's your starter. I'm sure they will offer this explanation.

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1 Answer

Battery drains while sitting


Hi Anonymous, perform the following tests:
1. Fill acid type batteries to proper levels.
2. Charge battery overnight at 1-2 amps you need 12.5 volts or better after charging.
3. Hook up battery positive cable, then with your multimeter on the milliamp scale connect one lead to the negative battery post and the other lead to the ground cable. Meter should read 3 milliamps or less, 10 milliamps with a radio, 15 milliamps with radio and CB. If your meter reads higher you need to isolate the circuit by pulling fuses and circuit breakers one at a time and observe meter for drop in aprerage then get out your test light and track down the short in that circuit.
3. Make sure all connections are clean and tight especially the negative cable at "BOTH" ends.
4. Hook up volt meter to battery and start engine, if meter falls below 9.5 v while cranking replace battery.
5. With engine running at 3600 RPM battery should read 14.3-14.7 volts if not continue tests.
6. Unplug voltage regulator from alternator at crankcase by front of primary cover.
7. To test voltage regulator go to: https://www.youtube.com/watch?v=F8EjV0IjW9Q
8. With ohm meter, one lead grounded, touch alternator pin meter should read infinity, if not replace stator.
9. With ohm meter, both leads touching alternator pins meter should read 0.1 to 0.2 ohms on 1989 and later models. 0.2 to 0.4 ohms 1988 and earlier models, if not replace stator.
10. With volt meter set on AC scale, both leads touching alternator pins meter should read
16 to 20 volts AC for every 1000 RPM'S 1989 and later and 19 to 26 volts AC for every 1000 RPMS. If not replace rotor.
17. For a free wiring diagram please visit the website below. Good luck and have nice day.
Harley Davidson Wiring Diagrams and Schematics

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1 Answer

Elec shorttruck


Have a volt meter? If so start the engine if you can get it charged uo and set the volt meter to 200
Them make sure the volt meter is set to the AC mode. I know it supposed to be set to the DC mode although we are doing a test, correct? Now with the meter set to the DC mode and the engine running, take the positive probe which is the RED one and place that on the NEGATIVE post of the battery. Now put the BLACK Probe one the POSITIVE side of the battery. If a reading of voltage shows of any sort the diode in the altenator is at fault. That problem causes the system not to charge the battery. Generally a diode will got out upon jumping another vehicle. You stated you bought an altenator new. If so new ones cost hundreds of dollars. If a lot lees you had purchased a rebuilt. Rebuilder do screw up so you may have a bad on here so running this test may find your problem very easy. If the voltage reading reads OL the altenator diode is good.

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1 Answer

The battery drains down in 48 hrs. I had a Ford mechanic look at it but he could not find out why it happens to my 1997 lincoln town car. Jim


I will try to help. First, find out if the Cruise Control was recalled for your car. Have a dealer run the Vin#. The bad ones never shut the power off.

Next, rear window defrost switches can short without the light indicator being lit up. This is a hard one to diagnose because it cycles every startup. Also bad ignition switches can leave the ignition on. Its silent and is not visible.

If none of the above, you have 2 ways to test the car.
Use OHMS or VOLTS. With volts you put the meter between 1 battery cable and the battery. You can short out something with this method. I favor the OHMS method, which you disconnect both battery cables and put the meter on the cables.

You will have to pull fuses with either method. Its time consuming but once you write down the fuse placement and size you will eventually disconnect the grounded fuse. Then trace the system, like a bad window switch or trunk pulldown.

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2 Answers

Battery drained every day,battery is brand new.


When it is running,put a volt meter across battery terminals. You should see 13 + volts if alternator is working. Also put an ampere meter in series with a battery cable,key off, engine off, and you should see less than 40 to 50 Mili-Amps. If more,start pulling one fuse at a time,untill you find the circuit that is draining the battery

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2 Answers

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You say your test light was hooked from the negative terminal of the battery to the chassis? This is correct?
If so you don't have a short you have an open circuit.
You will have a bad ground somewhere between the battery and the engine or between the the engine and the body. Trace your grounds.
If you need more help leave a messege in "add comments" and I will help you along.

KL

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1 Answer

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2 Answers

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you will need replace the fuse with a light bulb so that the power will not go away. and you will have to search for power going straight to a ground source.
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1 Answer

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incorrectly wired radio would cause problem.it would be the wire that is suppose to connect for dimming lights looks like a ground but is not has a yellow or a white stripe with black on it.use it as a ground and it will blow the fuse.

Feb 06, 2009 | 2002 Chevrolet Silverado 2500HD

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