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Old 12-11-2010, 06:33 PM
Doktor Bert's Avatar
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Join Date: Jan 2005
Location: Palm Springs, CA.
Posts: 2,670
116 Blower Motor Amperage Reduction Modification:


On the 116, there is a 5 pole, metal-case relay, directly behind the glovebox. It controls the blower motor. If you wiggle the relay, often the blower motor will speed up.

Adding a 12 ga. ground wire from the realy mounting screw to the metal body will reduce the blower motor's amperage draw.

NOTE: On my 116.120, there is a brown graound wire that exits the harness and grounds to the screw that mounts the relay AND continues into the harness. Other 116's I have seen DO NOT have a ground wire "loop" to the relay mounting screw and instead, ground the relay elsewhere in the harness.

With the blower running, wiggle the plug-in. IF the blower speed increases, you have either a broken solder joint on the circuit boards AND/OR the double contacts in the relay are dirty or making poor contact.

Mine were badly mis-aligned. Correcting this mis-alignment and sanding the contacts REDUCED blower motor amperage draw.

On my 116.120 and others I have seen the rear journal on the blower fan motor is exposed and can be seen spinning when the blower is operating. I aded a few drops of sewing machine oil to this area, which was immediately drawn into the spinning shaft/buhsing interface.

The blower motor immediately increased in rpm and amperage was again reduced.

My blower is the original unit and it is only drawing 14.7 amps in the defrost position.

Hope this helps...Robert


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