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Join Date: Mar 2020
Posts: 33
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internal regulator
Hi everybody. I have installed a new Internal Voltage Regulated Altanator in my 2.7 1975. I have seen the writing on how to use a resistor for the dash light. But can i jump the old three leg connection from the old external regulator so it will charge and light goes out on dash?
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08-07-2020, 09:49 PM
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ROW '78 911 Targa
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No, you need the extra load provided by the resistor to make the new VR work, and turn off the light.
Just disconnect and tape off the old VR wiring on the rear fuse panel.
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Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. |
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08-08-2020, 05:53 AM
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ROW '78 911 Targa
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The Porsche part is NLA.
Mouser has the 5watt 91 ohm resistor and terminals. Easy enough to make. 
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Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. |
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08-08-2020, 05:58 AM
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Join Date: Mar 2020
Posts: 33
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Is it necessary to have the resistor. Is it all wires on external regulator i just tape, what with the black on the distributor?
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08-08-2020, 07:04 AM
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ROW '78 911 Targa
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Yes, the Resistor is needed. PM me and I can make one just like the one in the photo for you. (without the lamp holder in the photo)
$18 shipped priority mail in the US. Tape off the Black at the alternator and tie it back. Yes, all wires at the external VR need to be removed from the old VR and Taped off or heat shrinked so they don't touch anything, as the blue wire is still in the circuit from the alternator to the bulb at the gauge.
__________________
Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. |
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08-08-2020, 07:14 AM
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Registered
Join Date: Mar 2020
Posts: 33
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Thank you for the info and help. I think posting to Denmark might be expensive. Regards Michael
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08-08-2020, 07:35 AM
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Join Date: Mar 2020
Posts: 33
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Sorry is it 91 oms or 0.91 oms you ment.
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08-08-2020, 07:37 AM
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ROW '78 911 Targa
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91 0hms 5 watts
__________________
Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. |
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08-08-2020, 07:45 AM
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Registered
Join Date: Mar 2020
Posts: 33
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Could se that it is a 91 ohm, will a 82 ohm work, canīt find a 91 in Denmark.
Last edited by mike.bike; 08-08-2020 at 08:02 AM.. |
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08-08-2020, 07:56 AM
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ROW '78 911 Targa
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I’m sure Porsche did the math to load the circuit Just enough to work. 83 May be too small. Anything from 91 to 100 ohms available?
If you can find a BA-7 Type 4 watt bulb, that would work. No resistor needed. I can only find 2 watt bulbs in this side of the pond...
__________________
Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. |
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08-08-2020, 08:13 AM
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Heinz
