L84sky

The 2001 Tracker has 29 fuses installed. Only 24 of them are functional.


Nine of them are located on the Fuse Block under the hood.


Eleven of them are located on the Junction Block.


One is located above the Junction Block


Two are located on the relay rack next to the Fuse Block


And one is located on the air bag harness.


This is a fuse map of the entire electrical system. It is too big to post here with decent resolution
but it is downloadable from this Dropbox link: https://www.dropbox.com/s/94067ovr9q...20map.png?dl=0


The important thing to know is there are two ignition (IG) fuses.
The red arrow is pointing to the 60-amp IG fuse on the under-hood fuse block.
The green arrow is pointing to the 20-amp IG fuse on the under-dash junction block.
The blue arrow is pointing to the ignition switch.
All the fuses to the left of the blue arrow are "hot at all times."
All the fuses to the right of blue arrow are only hot in "acc, on or start."

L84sky

ATC fuses have two metal projections in the fuse housing. These projections are test points for voltmeter leads.
12 volts between the test points indicate a blown fuse. A good fuse in a live circuit will show a voltage across
the test points in the millivolt (mV) range.


Fuse voltage-drop charts are available on the internet. These charts give a good approximation of the current passing through the fuse. In this example a 15-amp Tracker fuse
passes 1 amp (1,000 mA) of current when the voltage drop across the fuse measures 4.8 mV. Measuring current this way is a lot safer than replacing the fuse with an ammeter.


This last item is specific to the 2001 Chevy service manual. Note that the 60-amp IG fuse is not going to the Ignition Switch.


That's because Chevy reversed the fuse designations for the IG and Lamp fuses (in two places).


The car is built correctly, It's just the service manual that's wrong.


Suzuki had the wires identified correctly. Chevy just goofed up.

L84sky

Sometime back I wanted to know how much current the HVAC blower motor pulled on each fan setting.
The easiest way was to measure the voltage drop across the 30-amp fuse and look up the associated
current from the chart.


After I recorded the voltage drops, I replaced the fuse with an ammeter...


...and measured the current directly.


I was impressed how closely the two methods matched each other.