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Underhood fuse block swap out relay #7 thats the ECM relay. Ground Circuits Using a DVOM, touch negative voltmeter lead to a good ground. Touch positive voltmeter lead to each ground terminal. With vehicle running, voltmeter should indicate less than one volt. If reading is greater than one volt, check for open, corrosion and loose connection on ground lead. See ECM GROUND LOCATION table for ECM ground location. Page 1 of 1 SYSTEM/COMPONENT TESTS - 2.6L EFI -1994 Isuzu Rodeo
40 amp, labeled "HTR" 3rd from lrft, above little fuses, .located in fuse box in dash . if its blown, the blower motor may be bad. also ckeck fuse labeled "gauge" upper left corner 10 amp ( that makes the relay work)