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What does the shunt fuse do - Cars & Trucks

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1 Answer

Starter causing fuse to blow


Replace the starter and the starter solenoid. 99% sure the starter windings have simply shunted.

May 13, 2015 | 2008 Chevrolet Chevrolet Cobalt LT

1 Answer

Where is mall pgm fuse?


It is a shunt or fuse that is removed when programing or reprograming a keyless entry system such as a new remote key FOB.

Mar 13, 2015 | 1997 Chevrolet Venture

1 Answer

What is the 2004 Kia Optima shunt fuse under the dash


The Shunt Fuse Protects High Amp Circuits Like Alternator and Starter it is like a fusable link

Dec 22, 2014 | 2004 Kia Optima

1 Answer

Shunt fuse


Removing the shunt fuse will do the job the same as removing the battery terminal but the other way is to use the code reader to reset the cpu

Apr 05, 2013 | 2009 Ford Focus 1.6

1 Answer

New battery went dead. pulled the fuses and checked for a short. Found the fuse that shows a short just don't know what it goes too


A voltmeter is NOT the correct tool to check for an "ignition-off draw". A voltmeter will show 12 volts if ANYTHING is operating.

There are some things that are SUPPOSED to keep operating when the vehicle is shut off. These include, but are not limited to:
> Powertrain Control Module keep-alive memory
> Radio preset memory
> Clock
> Security/ alarm system
> Remote control recievers (door locks, etc.)

What you need to know is how many AMPS are being drawn from the battery when the vehicle is shut off. This is done by using a shunt bar connected between the battery terminal and the battery cable connector.

Set the ammeter to the lowest setting (usually 2 or 5 amp scale) Connect the ammeter leads accross the shunt bar. Turn off all electrical accessories, ignition switch, etc. and wait for a minimum of 45 minutes for all of the computer systems to go into "sleep" mode. Then open the shunt bar and read the amperage.

The "rule of thumb" is 300 milliamps (or 0.3 amps). This is where you have a problem. Anything less than this is not a problem and is not the cause of your dead battery. My experience is that most vehicles built in the last 15 years or so, will usually measure around 150 milliamps if there is no aftermarket equipment installed. Please note that even this 150 milliamps will measure as 12 volts if measured with a volt meter. A 2 amp draw will also measure as 12 volts....However, a 2 amp draw will kill your battery overnight and the 150 milliamp draw won't.

May 22, 2012 | 1999 Jeep Cherokee

1 Answer

Underhood fusebox fuse #13 50 amp what is it for


The large MAXI fuses in the engine compartment fuse block are the MAIN fuses. They supply voltage to several other fuses or circuits.

MAXI Fuse #13 in your 1996 Ford Ranger is supposed to be a 30 Amp fuse (not a 50 Amp) according to the power distribution diagrams as well as the fuse block detail diagram. This fuse supplies voltage to the Powertrain Control Module (PCM) power relay and to the oxygen sensor heater circuits.

Please note that it is NORMAL for this fuse to cause a draw on the battery during vehicle operation and also after engine shut down. The OBD-2 oxygen sensor heater circuit monitors run after engine shut down and key off. This can take up to 45 minutes to complete. After the O2 heater monitor has run, the PCM will go into sleep mode.

When the PCM goes into sleep mode, the battery draw from this fuse will be reduced greatly. If you are performing "ignition-off-draw" tests trying to figure out why the battery keeps going dead, it is best to use an ammeter that has a 1 or 2 amp scale. You should set-up for the test using a shunt bar. Wait for 45 minutes to an hour for all of the computer systems in the vehicle to go into sleep mode, then open the shunt. Your computer memory, radio pre-sets, clock, etc. will continue to draw without ever shutting completely off. Any draw under 300 Milliamps is considered "acceptable". It is my experience that most vehicles have an ignition-off-draw of somewhere near 150 Milliamps.

The underhood fuse box diagram can be found on page 314 in the 1996 Ford Ranger Owner's Manual.
If you do not have an Owner's Manual, you can get a PDF version HERE (direct link)

May 15, 2012 | 1996 Ford Ranger SuperCab

1 Answer

Radio doesnt work


Possible causes

1. Audio fuse (power shunt) blown or not fully pressed in
2. Audio Fuse not making a good connection in the fuse box
3. Radio is unplugged
4. Radio is burned out
5. Radio wiring (has been compromised by someone tinkering with it).

Go to www.hmaservice.com and register your vehicle by VIN #.. you'll then have access to wiring diagrams, shop manuals,service bulletins, illustrations, etc.

Hope that helps.

Jun 30, 2011 | 2001 Hyundai Accent

2 Answers

My reverse lights are not working. I changed the bulbs already and they still dont work


If the fuses are all good, then you need to try shunting the 2 terminals on the reverse light switch screwed into the side of the transmission.

Feb 01, 2011 | 1993 Toyota Land Cruiser

1 Answer

A/c switch on toyota previa van broken or doesn't engage. Where can I get another one? Price?


Switch not likely.
Relay or fuse much more likely.
Shunt at the switch first, to see if it works then.
Only buy switch if it works when shunted.
But getting a switch online is too trivial for us to look up for you.

Jun 01, 2010 | 1993 Toyota Previa

1 Answer

Connecting a 50 amp current guage


to the main fuse box under the hood between the fused side of the main junction across from batt. connection ( caution ---- make sure you fuse that line in case of a short) in fire wall and use no less then 6ga wire if this is not a shunted amp meter if it is shunted use proper fuse and wire for the shunt

Jun 27, 2009 | 2001 Dodge Ram 1500 Truck 2WD

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