L Connecting A Voltmeter A DC voltmeter is primarily used to measure voltage between a component or circuit to ground. Connect the negative lead of the meter to a ground and the positive lead to the point where voltage is to be measured. If your meter has various scales (such as 4.8.16 and 40 volts) use the lowest appropriate scale tor the greatest accuracy By measuring different points in a CIrCUIl (before and after a switch. tor example) you can measure voltage drop. An excessive voltage drop may be an indication of a malfunctioning component. Ohmmeter Connecltrig An Ohmmeter An ohmmeter measures the resistance between two paints Before installing an ohmmeter. disconnect the NEGATIVE terminal of the batterymeasuring on a hot circuit may cause ialse readings and damage your meter. if you suspect a section at CIrCUII having an excesswe resistance. Simply attach a lead to each end at the cichit (on a swnch. to each terminal) and read the resrstance DC Ammeter An amrneter measures current draw: They are often used to determine the operating condition of motordriven mechanisms such as the blower and power window To read current ilow: - Connect the ammeter in series with the circuit. - Connections may be made anywhere beyond a common point such as the point olcurrent ilow out oi the resistor pack. it may be connected either between the resistor pack and motor or the motor and ground. Fteter to the shop Manual tor Current draw specifications for specific motor~driven mechanisms. Fuse Block The iuse block shown below is used in both Bronco and F~Series vehicles. Forthe most part, fuses protect the same circuits in each vehiclethe exceptions are noted below Fuse Position Feed Wire Circuit Number Size Color Protected t Biank 2 3 Amp olir PRNDL Lamp. Cluster and instrument Panel Illumination 3 35 Amp 0 Heater NC 4 7 5 Amp rty Seat Belt Warning 5 7.5 Amp ry Carburetor Throttle Solenoid 6 7.5 Amp riy Auxiliary Fuel Tank Selector (This luse iF-100/350 Only) 15 blank, Bronco Only) 7 15 Amp bkiy Dome, Cargo, Courtesy. Glove Box and Underhood Lamps: Cigar Lighter and (F- Series Only) Lighted Vanity a 20 Amp bky Emergency Warning Flasher. Stop Lights 15 Amp bkigr Turn Signal Flasher 10 20 Amp bkgr Accessory Feeds. Speed Control, Power Tailgate Window (Bronco Only). Marker Lamp Relay. Dual Battery Flelay. Axle Control. Four-Wheel Drive Indicator Lamp 11 15 Am bk gr Back-Up Lamps. WIN" p Washer Pump 3 5 r o z 12 7 5 Amp bk gr Radio a 7