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Main Brown Power Feed Wire Size


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#1 robminibcy

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Posted 10 September 2019 - 12:34 PM

As above, What size (amp rating) is the thick brown wire that supplies power to the car from the starter solenoid?



#2 Spider

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Posted 17 September 2019 - 09:51 AM

A Harness I looked at today, from an early 80's car, the biggest Brown Wire was 3.0 mm2, a current rating of 28 amps.



#3 robminibcy

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Posted 17 September 2019 - 10:43 PM

A Harness I looked at today, from an early 80's car, the biggest Brown Wire was 3.0 mm2, a current rating of 28 amps.

cheers! Did actually measure it when I was able to get at the car and I too measured 3mm²

#4 GraemeC

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Posted 18 September 2019 - 05:47 AM

You measured 3mm^2? Or 3mm diameter?

3mm^2 is less than 2mm diameter

Edited by GraemeC, 18 September 2019 - 05:49 AM.


#5 viz139

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Posted 18 September 2019 - 01:48 PM

I agree with the above . It has to be at least 4mm sq or maybe even 6mm sq.

In auto electrics you will also see these sized as number of strands by  cross sectional area of each strand . 65x0.3 (4mm sq) and 84x 0.3 (6mm sq)



#6 Spider

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Posted 18 September 2019 - 06:47 PM

A Harness I looked at today, from an early 80's car, the biggest Brown Wire was 3.0 mm2, a current rating of 28 amps.

 

I can only say after many years of looking at most wires, I know what size they are.

 

3.0 mm2 wire was a size Lucas used in their harnesses. Still available from Autosparks.

https://www.autospar...0-30-25amp.html

 

The current rating is a continuous one. Higher currents can be drawn for shorter periods.



#7 richmondclassicsnorthwales

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Posted 19 September 2019 - 07:40 AM

I would indeed trust Mokes words - no reason not to 






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