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Username Post: Alternator output wire        (Topic#349655)
Big T 
"13th Year" Silver Supporting Membe
Posts: 2714
Big T
Loc: Simi Valley CA
Reg: 04-14-06
02-14-18 12:34 AM - Post#2724332    

Hi All
Been awhile. I am back on the 55.

Have a question. I have a SI12 alternator 98 Amps as I recall.

The charging system is finished, but I am now being told by Painless tech(bought their latch up disconnect for an additional layer of theft protection) that the 8AWG (stranded) alternator output wire I am using, is under rated because my bat is in the trunk and suggested I change it out for a 6AWG "cable".

6awg stranded cable "by the foot" is impossible to locate.

On top of that, that ckt has been in for a long time so now there are plenty obstructions added along its route.

The distance from alternator to the battery via the disconnect is roughly 12 feet. The 8awg passes through two single point terminal blocks on the way back to B+.

I wanted to check in with you for your thoughts and comments. If I have to do it, I have to do it.

Thanks in advance
Tom



Tom

55 4 door BelAir


 

Shepherd 
Frequent Contributor
Posts: 1374

Loc: Lake George, NY
Reg: 11-11-15
02-14-18 06:56 AM - Post#2724347    
    In response to Big T

Do you have a lot of high draw accessories in the circuit?



 
acardon 
Ultra Senior Member
Posts: 11045
acardon
Loc: DFW TEXAS
Reg: 03-25-05
02-14-18 08:18 AM - Post#2724352    
    In response to Big T

I think your fine with 8 gauge. You will never use the full 98 amps of the alternator unless the battery was completely dead and then you couldn't start the car to use the alternator.

Don
66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)


 
raycow 
Honored Member
Posts: 27694
raycow
Loc: San Francisco, CA
Reg: 11-26-02
02-14-18 09:12 AM - Post#2724356    
    In response to Big T

Pay a visit to your local home improvement store or electrical contractor supply outfit. Ask for 6 ga copper building wire by the foot. The stranding is different from automotive wire, so it is somewhat stiffer, but it will still work very well for your intended purpose. Make sure to specify copper, because it is also made in copper coated aluminum and you don't want that type.

I have been using this product on vehicles for many years with no complaints. Also, it is notably less expensive than automotive or welding cable of the same gauge.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
Big T 
"13th Year" Silver Supporting Membe
Posts: 2714
Big T
Loc: Simi Valley CA
Reg: 04-14-06
02-14-18 11:49 AM - Post#2724383    
    In response to Shepherd

I have is two large puller Spal fans (w/controller), classic auto A/C w/trinary, Aftermarket radio....using as is out of the box, 60x4 watts internal amp using only 2 6x9 speakers in the package deck, after market cruise control....not seeing that as being used very often, Dakota Digital dash...low power, all LED lights inside and out, using several relays to cut down on power going through the dash/switches.

At one time, I was thinking about using H4 head lights. But, looking into the newer LED hi/low head lights it's starting to look like a better choice. Bonus....less power

I live just outside of Los Angeles County with it's 10.2 million people. Lots of ambient light for night driving.

A couple of other things are low amp, intermittent use. Not planning on anything more.

Tom

Tom

55 4 door BelAir


 
PhilG 
Member
Posts: 7

Reg: 04-04-06
02-14-18 02:27 PM - Post#2724400    
    In response to Big T

Hey Tom
Check out https://www.wireandcableyourway.com/cart.php?m=vie...

SGT ( starter-ground thermal coating )copper wire @ .58/foot min 20 ft. US made









 
Big T 
"13th Year" Silver Supporting Membe
Posts: 2714
Big T
Loc: Simi Valley CA
Reg: 04-14-06
02-14-18 02:50 PM - Post#2724402    
    In response to PhilG

will do Phil
Thanks Tom


Tom

55 4 door BelAir


 
acardon 
Ultra Senior Member
Posts: 11045
acardon
Loc: DFW TEXAS
Reg: 03-25-05
02-14-18 03:22 PM - Post#2724407    
    In response to Big T

Do not use house wiring in your car. The insulation won't last very long at all. House wire is not made for heat or oil.

  • Quote:
The 8awg passes through two single point terminal blocks on the way back to B+



If I picture your wiring correctly, the battery is the only thing running off the full length of this wire. I'm thinking everything else is running off the terminal blocks. Is that correct? If so, the full length will never see the full amps of the alternator.

Don
66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)


 
Bluemeany 
Senior Member
Posts: 831
Bluemeany
Loc: Santa Clara, CA
Reg: 05-31-02
02-14-18 04:04 PM - Post#2724412    
    In response to Big T

Your battery is in the trunk and I assume you have the big positive cable going to the starter solenoid. You could run the 8AWG alternator wire to the same solenoid post.

57 Hardtop 302 & 3 Speed OD
93 Camaro Z28 Indy Pace Car


 
Shepherd 
Frequent Contributor
Posts: 1374

Loc: Lake George, NY
Reg: 11-11-15
02-14-18 06:08 PM - Post#2724429    
    In response to Bluemeany

Yeh, that is how I am set up. Seems that would solve the wire size and routing.



 
Big T 
"13th Year" Silver Supporting Membe
Posts: 2714
Big T
Loc: Simi Valley CA
Reg: 04-14-06
02-14-18 06:36 PM - Post#2724435    
    In response to acardon

Hi Don
Spot on. Alternator runs everything in the car on its way to the battery
Tom

Tom

55 4 door BelAir


 
raycow 
Honored Member
Posts: 27694
raycow
Loc: San Francisco, CA
Reg: 11-26-02
02-15-18 03:08 AM - Post#2724449    
    In response to acardon

  • acardon Said:
Do not use house wiring in your car. The insulation won't last very long at all. House wire is not made for heat or oil.....


I agree that the older types of building wire might not be the best choice for use on a motor vehicle. However, the present type is THHN, which has an extremely tough nylon outer layer that is heat, oil, and abrasion resistant. I have never had any insulation failures with this type, even when installed in direct contact with the engine.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
Big T 
"13th Year" Silver Supporting Membe
Posts: 2714
Big T
Loc: Simi Valley CA
Reg: 04-14-06
02-27-18 10:11 AM - Post#2725838    
    In response to Shepherd

Little late
Thank you all for your help
Tom

Tom

55 4 door BelAir


 
Big T 
"13th Year" Silver Supporting Membe
Posts: 2714
Big T
Loc: Simi Valley CA
Reg: 04-14-06
02-27-18 02:58 PM - Post#2725856    
    In response to Shepherd

Thank you all for your information. Really appreciate it.
Tom

Tom

55 4 door BelAir


 

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