CONTINUITY CHECK

TM55-1730-228-13&P

Quick Reference

RESISTANCE CHECK

(1) SET SCALE SELECTOR SWIT H ON +DC.

(2) SET RANGE SELECTOR SWITCH ON R x 1.

(3) TOUCH METER LEADS TOGETHER AND TURN ZERO OHMS ADJUST UNTIL NEEDLE IS 0 OHMS.

(4) BE SURE THERE IS NO BATTERY VOLATAGE CONNECTED TO CIRCUIT TO BE CHECKED.

(5) ATTACH NEGATIVE LEAD (BLACK) TO VEHICLE FRAME.

(6) TOUCH POSITIVE LEAD (RED) TO TERMINAL OF COMPONENT BEING CHECKED.

(7) READ RESISTANCE ON METER SCALE.

(8) IF METER NEEDLE DOES NOT MOVE, CIRCUIT IS OPEN.

(9) IF METER NEEDLE MOVES COMPLETELY ACROSS SCALE TO 0 THERE IS EITHER A SHORT

CIRCUIT OR A HEAVY-DUTY COMPONENT WITH VERY LOW RESISTANCE.

d. Read the ohms on the black area at the top of the scale.

NOTE

For range R x 1, read the figures directly; for range R x 100 multiply the reading indicated by 100 or add

two zeros to the reading; for range R x 10,000 multiply the reading indicated by 10,000 or add four zeros to

the reading.

e. An infinite reading is an open circuit reading. There will be no movement of the multimeter pointer on the R x 1

range scale when an open circuit exists. This usually indicates a broken connection somewhere. Infinite position

on the ohmmeter range scale is marked with the symbol

f. A zero reading indicates a continuous circuit with resistance too low to be measured with the multimeter. Where

two cable wires, or a circuit wire and ground connection are being checked this usually indicates a short circuit

somewhere.

3-13 CONTINUITY CHECK (Figure 3-15)

3-13

a. Set up and zero the multimeter.

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