 Heater blower Fan -Ground wire |
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| young55961 |
 Jan 29 2026, 11:01 AM
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#1
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Newbie  Group: Members Posts: 13 Joined: 15-March 18 From: Arcadia Member No.: 21,972 Region Association: Southern California  |
Hi,
I just replace a new motor to the Heater blower box. I know the connector wire consist of four wires, the main power, and 3 control, but where the ground wire. Did I miss anything? Billy |
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| JeffBowlsby |
Jan 29 2026, 12:03 PM
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#2
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914 Wiring Harnesses & Beekeeper Group: Members Posts: 9,167 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None 
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The heater fan is in the engine bay and has only two wires. I think you are referring to the fresh air fan under the cowl? If so the ground is through the fresh air fan relay.
Check the schematics for your model year here: https://bowlsby.net/914/WiringHarnesses/#ReferenceLibrary |
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| TRP |
Jan 29 2026, 01:35 PM
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#3
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Member Group: Members Posts: 189 Joined: 2-September 23 From: Morgan Hill, CA Member No.: 27,559 Region Association: None
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To Jeff's point, heater blower fan is in the engine bay with two wires, orange and green on a 75. Those two wires have connectors that go to the harness by the relay board.
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| young55961 |
Jan 29 2026, 01:39 PM
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#4
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Newbie Group: Members Posts: 13 Joined: 15-March 18 From: Arcadia Member No.: 21,972 Region Association: Southern California |
QUOTE(JeffBowlsby @ Jan 29 2026, 01:03 PM)  The heater fan is in the engine bay and has only two wires. I think you are referring to the fresh air fan under the cowl? If so the ground is through the fresh air fan relay. Check the schematics for your model year here: https://bowlsby.net/914/WiringHarnesses/#ReferenceLibrary Yes, I am referring to the fresh air fan. Mine is a 1975 914. I’m still a bit confused. I’m looking at the entire assembly, and it appears to be all plastic. How is it grounded? Regards, Billy |
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| cholland_ |
Jan 29 2026, 01:47 PM
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#5
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Member Group: Members Posts: 75 Joined: 11-October 06 From: Toronto, Ontario Member No.: 7,029 Region Association: None |
If I recall, theres a red and white wire that provides power from the fuse box.
The other three white wires provide ground via the control panel in the dashboard, through the speed resistor pack. |
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| young55961 |
Jan 29 2026, 02:13 PM
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#6
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Newbie Group: Members Posts: 13 Joined: 15-March 18 From: Arcadia Member No.: 21,972 Region Association: Southern California |
QUOTE(cholland_ @ Jan 29 2026, 02:47 PM) If I recall, theres a red and white wire that provides power from the fuse box. The other three white wires provide ground via the control panel in the dashboard, through the speed resistor pack. Thank you. I understand now. |
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| 930cabman |
Jan 29 2026, 05:04 PM
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#7
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Advanced Member Group: Members Posts: 4,469 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States
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