I want to check the 3-pin and 4-pin relays. As shown in the figure, explain the inspection method using a general analog tester when the power (battery) is connected and when it is not connected.
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How to check the relay when power is connected or not connected
How to check the relay when power is connected or not connected
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A. How to connect and check power
1) Put the tester in the DC voltage range.
2) Put the switch with the tester black (-) lead on the (-) of the battery, and then put the tester red (+) lead on the relay No. 1, and if the battery voltage is all applied, the relay and wiring are considered normal.
B. How to check without connecting power
1) Put the tester on the resistance range.
2) Try turning ON/OFF the switch on relays 3 and 4.
If the resistance indicates 0 when the switch is ON and infinity when the switch is OFF, the switch is normal.
3) When measuring between relays 2 and 4, if tens to hundreds of Ω are displayed, the relay coil is normal.
4) When measuring between relays 1 and 2, if several tens of Ω comes out, the tail lamp is normal.