American Auto Wire
Username Post: Car Stereo        (Topic#343655)
pro552000 
Forum Newbie
Posts: 14

Reg: 10-09-15
03-29-17 12:10 PM - Post#2684031    

Hello Donnie.
My son is putting a bigger Amplifier into his 81' GMC truck. We would like to install a 105 amp alternator to help cover the extra draw on the Battery. It has been recommended to up size the wire for the alternator to a 6 or 8 gauge. My question is which wire should we replace? The red plug in wire on the alt or the red terminal wire on the lug of the back of the alt? Loren.



 
aawtech 
American Autowire "Site Sponsor"
Posts: 5028

Loc: Bellmawr, NJ
Reg: 09-11-06
03-29-17 08:30 PM - Post#2684125    
    In response to pro552000

  • pro552000 Said:
Hello Donnie.
My son is putting a bigger Amplifier into his 81' GMC truck. We would like to install a 105 amp alternator to help cover the extra draw on the Battery. It has been recommended to up size the wire for the alternator to a 6 or 8 gauge. My question is which wire should we replace? The red plug in wire on the alt or the red terminal wire on the lug of the back of the alt? Loren.



The lead on the stud. Do you have stock wiring in this truck? That's gonna get tricky if so.

Donny




 
pro552000 
Forum Newbie
Posts: 14

Reg: 10-09-15
03-30-17 06:09 AM - Post#2684151    
    In response to aawtech

Yes it still has the original wire harness. Why is this going to be tricky? Does this wire run to the starter or the fuse block? And thanks for the quick reply!



 
aawtech 
American Autowire "Site Sponsor"
Posts: 5028

Loc: Bellmawr, NJ
Reg: 09-11-06
03-30-17 09:28 PM - Post#2684272    
    In response to pro552000

  • pro552000 Said:
Yes it still has the original wire harness. Why is this going to be tricky? Does this wire run to the starter or the fuse block? And thanks for the quick reply!



Because that original alternator wire is part of the original engine harness and it is probably in a charging splice. I'd have to pull the original GM print to look.

Donny





 
pro552000 
Forum Newbie
Posts: 14

Reg: 10-09-15
03-31-17 10:12 AM - Post#2684339    
    In response to aawtech

So if it has this split in it. Then I assume you would have to replace all wires associated with that main line correct? And would this be okay to do? I will have the truck at my place tomorrow so I can do some wire tracing then.



 
Socaldave 
Forum Newbie
Posts: 6

Age: 37
Loc: So Cal
Reg: 06-11-17
06-11-17 07:02 AM - Post#2695465    
    In response to pro552000

First off, going 6 to 8 gauge wire would be downsizing. The lower the number the bigger the diameter of the wire. Upsizing would be going to 4, 2 or even 1/0 (although 2 gauge or bigger might be overkill).

Also, you can always run a wire separate from the wire harness. Just make sure that you use the correct le goth wire (taking into account that the motor will move on acceleration). Also remember to properly route the wire away from exhaust, and properly secure it.

'58 impala Casmere Blue: ridetech suspension, wilwood 14" brakes, tubular a-arms
Soon: custom autosound radio, Phoenix gold amplifiers, Boston acoustics speakers/subwoofers, singer 240a alternator


 
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