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|5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)|
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Originally Posted by 16valex
You can direct power to the four wires connector to troulble shoot your fan motor issue.
- The big brown wire is negative, the rest of the wires are positive. So if you hook up a battery negative to brown and any of the positive wires to the positive terminal should cause the fan to spin, and this is assuming your motor and the resistor pack are still good.
-If your fan motor spins when you power direct from the connector then your problem is upstream and that means it could be either the relay or the fan switch.
- if your motor doesn't spin when direct power to the connector then your problem is in the auxiliary fan assembly and that could be the resistor pack or the motor.
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