 Engine harness question- heater fan power |
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| roundtwo |
 Jun 19 2026, 04:52 PM
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#1
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Member  Group: Members Posts: 356 Joined: 9-February 20 From: Petaluma, CA Member No.: 23,905 Region Association: Central California 
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Hello,
Swapping out the 2.0 l engine in my 1971 for another 2.0 l ...Has lower miles (35k) and documented build. Both engines carbed I see the engine harness in a bit different at the end that connects to fan blower. Pic 1 is the from the existing engine that had the fan blower mounted. Has the two wire connector to plug into the fan plug... Pic 2 is from the replacement engine. I only see a white wire that is spare. Could this be the fan power and then I use a common ground? In understand what the other wires in the pic connect to. Thanks the help going forward pic 1  pic 2  car  |
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| JeffBowlsby |
Jun 19 2026, 05:14 PM
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#2
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914 Wiring Harnesses & Beekeeper Group: Members Posts: 9,286 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None
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Use the ignition harness in Pic 1 on your 1971 car, its correct for your set-up, with the fan mounted to the engine. The Pic 2 harness is for 1973-76 cars with the heater fan mounted to a stand on chassis.
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| JeffBowlsby |
Jun 19 2026, 05:14 PM
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#3
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914 Wiring Harnesses & Beekeeper Group: Members Posts: 9,286 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None
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Use the ignition harness in Pic 1 on your 1971 car, its correct for your set-up, with the fan mounted to the engine. The Pic 2 harness is for 1973-76 cars with the heater fan mounted to a stand on chassis.
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| roundtwo |
Jun 19 2026, 08:07 PM
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#4
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Member Group: Members Posts: 356 Joined: 9-February 20 From: Petaluma, CA Member No.: 23,905 Region Association: Central California
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@JeffBowlsby
I knew you would know and was hoping you weren't on vacation!!! Thanks Jeff Assume all I have to do is disconnect both from the alternators?  |
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| JeffBowlsby |
Jun 19 2026, 08:56 PM
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#5
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914 Wiring Harnesses & Beekeeper Group: Members Posts: 9,286 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None
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Alternator? The ignition harness connects to the relay board, not the Alternator.
You can find diagrams of the two harnesses on my harness website. |
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