STARTER MOTOR RELAY FAILURE

On diagnosing starter motor relay, you will need the following tools first.

1. Screwdrivers
2. Test lights
3. A piece of wire to act as a jumper
4. Wrenches and socket sets (in case you need to lose anything).
Make sure your battery is fully charged or you get one and a portable jumper cable. here goes the procedure
i. Find the starter relay fuse location. The fuse location may vary from vehicle to vehicle. The fuses are majorly located close to the battery sitting with the positive battery terminal connected to it.
ii. Have an assistant help you turn the ignition key to the ON position:
• A weak click sounds? Then conduct an electrical resistance test.
• An audible click? Then diagnose the starter relay for voltage drop.

For weak click sound:

"i. Get a multimeter and set it on the ohms scale. Contact one of the probes on the earth lead and the other on the ignition circuit terminal. A good starter relay should read below 5 ohms. Any reading above that indicates a defective relay.
ii. you can also run the test by using other method; contact the red multimeter probe to the ignition circuit wire and the other probe to the earth wire. If it reads less than 12V when you turn on the ignition switch, it indicates a faulty relay.
"

For audible click sound:

i. Reset your multimeter to be on 20V (volt) DC
ii. Contact the red probe of the multimeter on the red terminal lead from the battery. Place the black and thin wire on the lead that goes to the ignition circuit lead switch.
iii. Tell your assistant to turn the ignition key to the ON position as you examine the multimeter reading the voltage should not be above 0.2V. If the multimeter reads above 0.2V, either you have a bad starter relay or a problem with the electrical conductivity of the starter relay that needs proper attention. You must check the connectors and clean them.