 914-6 Alternator question, about the regulator |
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| db9146 |
 Dec 16 2016, 03:04 PM
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#1
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Senior Member  Group: Members Posts: 953 Joined: 21-December 04 From: Atlanta, GA Member No.: 3,315 Region Association: None 
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So my understanding is that on a 914-6, the original alternator does not have a voltage regulator on the alternator but instead, the VR is on the circuit board in the 2.5" tall rectangular tin enclosure.
The 911 engines have an integrated VR on their alternators, I believe. So when you go to replace an alternator on a -6 and all you can find is one for a 911 with an integrated VR, how is the wiring different? What happens at the circuit board? The notes on Pelican regarding their alternators just says "some wiring mods may be necessary", which is kinda vague. any thoughts? |
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| brant |
Dec 16 2016, 03:07 PM
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#2
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914 Wizard Group: Members Posts: 11,623 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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only the later 911's have an internal voltage regulator
I'm pretty sure the 3.2's do... I'm not sure what year it changed though I know the mid 70's 911's also had an external regulator like a 914 or like a stock 914 wiring harness has |
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| johnhora |
Dec 16 2016, 03:30 PM
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Senior Member Group: Members Posts: 866 Joined: 7-January 03 From: Derby City KY Member No.: 107 Region Association: None
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I think the 911 changed to the internal VR around the 75 models...that's when the size of the alt changed...so the 75 up would have internal VR
you may find some info on the 911 Registry site.... as brant mentioned the early 911 were just like the 914 with an external VR and many have hot rodded their early 911 to 3.0 3.2 and above and have done the electrical conversion... CORRECTION: From the Bird... http://www.pelicanparts.com/techarticles/1...Replacement.htm All 911s up to 1981 had external regulators and from 1982-on, the alternators had built-in ones. This is the one on the 75' MY I remember.... Voltage Regulator - Marchal, (On Alternator) Part #: 911-603-913-01-M120 |
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| Steve |
Dec 16 2016, 06:34 PM
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#4
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914 Guru Group: Members Posts: 5,585 Joined: 14-June 03 From: Orange County, CA Member No.: 822 Region Association: Southern California
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Back in the mid 80's I bought a 74 2.7 short block and bought an alternator with an internal regulator in it. At that point I dumped the relay board and wired everything direct. Didn't need anything on the board for my six.
Sorry... didn't realize it was a real six!! You will want to leave it stock. |
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| 914Sixer |
Dec 16 2016, 07:12 PM
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#5
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914 Guru Group: Members Posts: 8,882 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region
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Yes, the -6 voltage regulator is on the relay board just like the rest of the cars.
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| gcrotvik |
Dec 16 2016, 07:46 PM
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#6
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Member Group: Members Posts: 360 Joined: 16-December 09 From: Portland Oregon Member No.: 11,134 Region Association: Pacific Northwest |
QUOTE(914Sixer @ Dec 16 2016, 05:12 PM)  Yes, the -6 voltage regulator is on the relay board just like the rest of the cars. Mark, is the regulator the same for both the 4 and the 6 cylinder cars? Sorry to hijack this thread. Greg |
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| Larry.Hubby |
Dec 16 2016, 09:58 PM
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#7
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Member who doesn't post much, but has a long time in 914s Group: Members Posts: 186 Joined: 24-November 04 From: Palo Alto, CA Member No.: 3,172 Region Association: Northern California |
Porsche didn't change to the internal regulator on the 911 models until the '82 model year. And the regulators for the early 911s ('70-'73) and the 914-6 are the same, P/N 911 603 206 02 (if they're Bosch), but the 914-4 regulators are a different part number.
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| 914Sixer |
Dec 17 2016, 07:58 AM
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#8
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914 Guru Group: Members Posts: 8,882 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region
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Greg,
They do show different part part numbers BUT they are pretty much interchangeable. Now the only Bosch regulator available is one one for the 911 but it shows to work for the 914 too. |
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| johnhora |
Dec 17 2016, 09:13 AM
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#9
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Senior Member Group: Members Posts: 866 Joined: 7-January 03 From: Derby City KY Member No.: 107 Region Association: None
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Larry is correct...
From the Bird... http://www.pelicanparts.com/techarticles/1...Replacement.htm All 911s up to 1981 had external regulators and from 1982-on, the alternators had built-in ones. This is the one on the 75' MY I remember...it was a Marchal alternator with a regulator attached to it. Voltage Regulator - Marchal, (On Alternator) Part #: 911-603-913-01-M120 |
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| TravisNeff |
Dec 17 2016, 10:50 AM
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#10
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914 Guru Group: Members Posts: 5,082 Joined: 20-March 03 From: Mesa, AZ Member No.: 447 Region Association: Southwest Region
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Does anyone know if there is a problem running the internal regulator with the original external? I would guess that it would not hurt a thing.
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| Luke M |
Dec 17 2016, 01:29 PM
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#11
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Senior Member Group: Members Posts: 1,371 Joined: 8-February 05 From: WNY Member No.: 3,574 Region Association: North East States
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I thought the internal reg started with the mid year 2.7. My 77 2.7 has an int-reg alt.
when i bought it. Here's some alt info. You can run the int-reg on the earlier cars but the rear air deflector needs to be modified to fit over the reg. I went back to the ext-reg as it's a real pain in the rear to change the alt in a 914-6. Attached image(s)  
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| larryM |
 Dec 17 2016, 02:47 PM
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#12
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emoze Group: Members Posts: 891 Joined: 1-January 03 From: mid- California Member No.: 65 Region Association: Northern California
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this may help -
beware - there are some incorrect "upgrade" wiring diagrams out there - i learned it THE HARD WAY - had to R&R the alternator a second time due to wrong diagram supplied by vendor with my new alternator DO NOT try to run both the oem regulator along with the new IR setup - if you are obsessed with the look of originality - just clip off the wires or the blades that feed it in your relay plate (fortunately, i have a "firewall porthole", so was able to do it without totally dismantling the top of the engine) . pictured: a new 911 Valeo on my 2.7 with webers (... have since upgraded to a 3.2 motronic)  .  .  |
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| db9146 |
Dec 18 2016, 10:36 PM
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#13
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Senior Member Group: Members Posts: 953 Joined: 21-December 04 From: Atlanta, GA Member No.: 3,315 Region Association: None
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Thanks for the info but I believe I'm going to go with a remanufactured alternator that still uses an external voltage regulator so that all of the wiring and circuit board remains unchanged. Besides, the current wiring is sized for a 50-55 amp alternator and I've already changed to LEDs to lighten the load.
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