Blower not working
- Thread starter Lewis07
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The usual reply to electrical problems is to check, clean and re-secure the earth tags ...
jai_landrover
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What age of defender??
On my old pre defender 1986
The switch earths the motor out either through a resistor slow speed or direct to earth. My resistor has been blown since install and a new replacement is heater box out and £100 for the resistor and harness however a replacement resistor is about £7-20 on its own.
If the same age, Go under the bonnet and pull the connector (3 pin Lucas type) the purple wire is the perm live to the motor and two green green yellow, another green are the returns to the switch that either go from the motor through the resistor or straight from the motor. The switch in the cab directs these two to ground.
I am making up a remote resistor and a plug in harness between the three way connector to get my slow speed back.
If you put power to the purple plug that goes to the motor and the ground one of the green wires the motor should spin up easy with a power probe. If it doesn’t try the other green as you too may have a burnt out or open
Circuit resistor. If you confirm that the motor runs then you know that it is ok. I’d then check you have a feed to the purple from the harness feeding the motor. If you have then I’d suspect the ground to be an issue either bad switch or bad connection. Work your way back through until you isolate the failed part.
A power probe makes this a 5 - 10 minute deal I did mine last weekend.
Good luck.
Later models will have different wiring and colour codes but if you search online for your year and model the wiring diagram is freely available.
On my old pre defender 1986
The switch earths the motor out either through a resistor slow speed or direct to earth. My resistor has been blown since install and a new replacement is heater box out and £100 for the resistor and harness however a replacement resistor is about £7-20 on its own.
If the same age, Go under the bonnet and pull the connector (3 pin Lucas type) the purple wire is the perm live to the motor and two green green yellow, another green are the returns to the switch that either go from the motor through the resistor or straight from the motor. The switch in the cab directs these two to ground.
I am making up a remote resistor and a plug in harness between the three way connector to get my slow speed back.
If you put power to the purple plug that goes to the motor and the ground one of the green wires the motor should spin up easy with a power probe. If it doesn’t try the other green as you too may have a burnt out or open
Circuit resistor. If you confirm that the motor runs then you know that it is ok. I’d then check you have a feed to the purple from the harness feeding the motor. If you have then I’d suspect the ground to be an issue either bad switch or bad connection. Work your way back through until you isolate the failed part.
A power probe makes this a 5 - 10 minute deal I did mine last weekend.
Good luck.
Later models will have different wiring and colour codes but if you search online for your year and model the wiring diagram is freely available.
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