Replacing Alternator
Pro
Joined: Oct 2020
Posts: 646
Likes: 295
From: Blairsville, Ga
what upgraded wiring are you referring to?
I have all new Lectric Limited wiring harnesses, but they are all OEM type replacements.
Are there heavier duty upgrades that need to be done if installing a higher output alternator?
I plan to install a vintage air system later down the road, as well as a fairly low key radio, but not sure it will be used that often.
I’m on the fence about electric fans.
Thread Starter
Obsessed
Joined: Apr 2019
Posts: 627
Likes: 394
From: Valencia, Spain
2025 C3 ('68-'73) of the Year Finalist - Unmodified
2023 C3 of the Year Finalist - Unmodified
2019 C3 of Year Finalist (stock)
Well if I don’t find the through bolt and the plastic retainer ring is broken I need one of those replacement packs like you have. Are the still available? Yours is NOS, I’m probably not going to find one… specially here in Spain.
Race Director
Joined: Nov 2006
Posts: 13,238
Likes: 7,830
From: Sunshine Coast, Queensland, Australia
2025 C3 of the Year Finalist - Modified
2024 C3 of the Year Finalist- Modified
2022 C3 of the Year Finalist - Modified
Cruise-In VIII Veteran
Yes. There are heavier wiring upgrades that need to be done when installing a high output alternator. Check out the thread he started in C3 tech.
And / or go to Mad Electricals web site and read there tech pages.
And / or go to Mad Electricals web site and read there tech pages.
Safety Car
Joined: Oct 2007
Posts: 4,380
Likes: 1,746
From: Seattle Area Washington
Because you have A/C you want at least 61-63 and a MAX output around 80 amps.
I installed a NEW 80 amp alternator in my well optioned 77 years ago and have had no problems with the charging system.
Ordering the bolt kit alone is half of the price of ordering the complete kit I posted above that comes with the new bolt and attaching hardware.
How do you normally order parts?
Do you use E-bay?
Thread Starter
Obsessed
Joined: Apr 2019
Posts: 627
Likes: 394
From: Valencia, Spain
2025 C3 ('68-'73) of the Year Finalist - Unmodified
2023 C3 of the Year Finalist - Unmodified
2019 C3 of Year Finalist (stock)
If you cant find the rebuild kit that comes with all you need, I would then just bite the bullet and purchase a new 3 wire 10si alternator.
Because you have A/C you want at least 61-63 and a MAX output around 80 amps.
I installed a NEW 80 amp alternator in my well optioned 77 years ago and have had no problems with the charging system.
Ordering the bolt kit alone is half of the price of ordering the complete kit I posted above that comes with the new bolt and attaching hardware.
How do you normally order parts?
Do you use E-bay?
Because you have A/C you want at least 61-63 and a MAX output around 80 amps.
I installed a NEW 80 amp alternator in my well optioned 77 years ago and have had no problems with the charging system.
Ordering the bolt kit alone is half of the price of ordering the complete kit I posted above that comes with the new bolt and attaching hardware.
How do you normally order parts?
Do you use E-bay?
Burning Brakes
Joined: Oct 2022
Posts: 1,063
Likes: 170
From: Buckeye Lake, OH
At the very least you will want to run a new 2 ga wire from the alternator post to the battery. I'm upgrading my alternator as well....
Instructor
Joined: Apr 2016
Posts: 205
Likes: 37
From: Plano Texas
Doesnt the wiring run from alternator to starter, then to battery? Are you saying it’s better not to run it to the starter and instead to the battery directly?
Race Director
Joined: Nov 2006
Posts: 13,238
Likes: 7,830
From: Sunshine Coast, Queensland, Australia
2025 C3 of the Year Finalist - Modified
2024 C3 of the Year Finalist- Modified
2022 C3 of the Year Finalist - Modified
Cruise-In VIII Veteran
If you run it to the starter, your tying into the main positive battery cable at the solenoid. If your positive battery cable is in good condition. It makes very little difference to run a cable all the way back to the battery.
just watch out with EFI computers. They are very touchy and need very smooth power and a very clean ground. EFI power and ground should come straight off the battery. Your alternator isn't that touchy.
just watch out with EFI computers. They are very touchy and need very smooth power and a very clean ground. EFI power and ground should come straight off the battery. Your alternator isn't that touchy.
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Thread Starter
Obsessed
Joined: Apr 2019
Posts: 627
Likes: 394
From: Valencia, Spain
2025 C3 ('68-'73) of the Year Finalist - Unmodified
2023 C3 of the Year Finalist - Unmodified
2019 C3 of Year Finalist (stock)
Yes there is, but most likely all of these cheep kits are made overseas.
Here is one of those kits for up to a 75 amp 10si alternator,
E-bay LINK: https://www.ebay.com/itm/19060680196...Bk9SR6TKx_KxYQ
Here is one of those kits for up to a 75 amp 10si alternator,
E-bay LINK: https://www.ebay.com/itm/19060680196...Bk9SR6TKx_KxYQ
