Installed a higher output alternator and its killing my battery!

T_Roberts

New Member
Dec 8, 2019
27
2
3
21
South Carolina
Hi all, I installed the PA performance alternator from American muscle that has an output of 200 amps. I also purchased the PA performance premium power wire kit to accommodate the bigger load from the alternator. upon installing these items, my battery was reading low on the cars dashboard and under heavy loads, the car would jug. Today, I took it to autozone and had them test the battery and as I pulled into autozone, the cars electronics died and the car jugged and jugged until it was turned off. It would then not turn on until it was jump started so we assumed the battery was bad. I got a new battery and she started right up. He checked my battery and alternator and the car consistently failed the voltage test because it was producing either to high a voltage or too low a voltage. The battery light on the dash stays on but the battery voltage bar stay slightly above halfway. Any reasons why a new alternator would cause this Do I need a bigger battery possibly? Thanks for any help/advice!
 

Attachments

  • 20201216_171322.jpg
    20201216_171322.jpg
    240.9 KB · Views: 31
  • 20201216_171315.jpg
    20201216_171315.jpg
    257.3 KB · Views: 32
  • 20201216_171219.jpg
    20201216_171219.jpg
    214.2 KB · Views: 29
  • 20201216_171210.jpg
    20201216_171210.jpg
    289.6 KB · Views: 33
  • Sponsors(?)


HemiRick

Active Member
Jun 28, 2020
553
186
53
57
Memphis TN
Your new alternator setup is not working as it should.....the battery is not the problem, its a symptom. Do you have a Volt ohm meter?
 

HemiRick

Active Member
Jun 28, 2020
553
186
53
57
Memphis TN
Dont have a clue....Depends on the alt.....1st thing I'd do is double check everything you touched. For an alt to charge it needs voltage to its field wire....a working system running should be at 14.3-14.4 volts
 

T_Roberts

New Member
Dec 8, 2019
27
2
3
21
South Carolina
Dont have a clue....Depends on the alt.....1st thing I'd do is double check everything you touched. For an alt to charge it needs voltage to its field wire....a working system running should be at 14.3-14.4 volts
Alright, so I switched out the PA performance wire kit back for the stock ford wire kit and the battery light turned off. Not sure yet if this fixed the issue but strange how a bigger wire could cause so much issue
 

T_Roberts

New Member
Dec 8, 2019
27
2
3
21
South Carolina
Post pictures of everything to include the connection points for your new harness.
I'll get some pictures soon. Not near the car right now. With the old wire kit on, the car struggles to start initially but when she's running she runs great. The new wire kit at least starts every time. Weird
 

Mustang5L5

i'm familiar with penetration
Mod Dude
Feb 18, 2001
35,505
11,557
224
Massachusetts
You would assume so, but you never know. Could also be an issue with how the alt was wired.

you can remove the alt and take it to a parts store to be tested. They will be able to tell if the voltage regulator is in spec or not
 

a91what

SendMeUrDataLog
Mod Dude
Apr 6, 2011
10,246
6,369
214
32
Hillsborough county
If the regulator circuit is staying powered full time then it will kill the battery. What instructions did you use when it was wired in?
 

T_Roberts

New Member
Dec 8, 2019
27
2
3
21
South Carolina
You would assume so, but you never know. Could also be an issue with how the alt was wired.

you can remove the alt and take it to a parts store to be tested. They will be able to tell if the voltage regulator is in spec or not
Well, when I took the car to autozone for them to run tests on the alt and the battery, they said everything was fine with the stock ford wire kit intalled. The only issue was prompted qhen the new wire kit was in. Wouldnt that mean that the alt is in spec and it's just the car doesn't like the new wire kit?
 

T_Roberts

New Member
Dec 8, 2019
27
2
3
21
South Carolina
If the regulator circuit is staying powered full time then it will kill the battery. What instructions did you use when it was wired in?
I had no general instructions for wiring my year car. No video, no manual, nothing.....so I just rewired everything the same way it was originally. I also, as of last night, moved the wire that went to the side of the fuse box straight to the battery terminal
 

KRUISR

Well-Known Member
Apr 16, 2015
584
202
63
50
From your first pic I will assume you have an SN95 car. What wiring changed going from Ford wiring to PA kit? (I am unfamiliar with that kit)

When I did a 3G alt in my fox I used a power cable from a Freestar (on the Freestar it goes alt post across the engine bay to battery post - single 4 ga wire, so that's what I did, no fuse inline).

As asked above, what is your voltage across the battery when idling and at 1500-2000 RPM (with both wiring systems)?
 

T_Roberts

New Member
Dec 8, 2019
27
2
3
21
South Carolina
From your first pic I will assume you have an SN95 car. What wiring changed going from Ford wiring to PA kit? (I am unfamiliar with that kit)

When I did a 3G alt in my fox I used a power cable from a Freestar (on the Freestar it goes alt post across the engine bay to battery post - single 4 ga wire, so that's what I did, no fuse inline).

As asked above, what is your voltage across the battery when idling and at 1500-2000 RPM (with both wiring systems)?
The only difference i know is that the pa premium power wire kit has a fuse in between the battery and the alternator. The other questions....I do not know how to test and what to look for. The car will not start without a jump start anymore anyways. I installed an optima performamce battery with 800 CCA to see if that would fix it but it does not. The car only cranks and does not start until it is jump started
 

nickyb

WAIT,you now have a pair?
10 Year Member
Apr 3, 2009
913
391
93
58
nevada
Look at the 3g alt. Install write up, you can't go wrong following that.
 

T_Roberts

New Member
Dec 8, 2019
27
2
3
21
South Carolina
Alright...back at this again. After getting stranded in a parking lot and having the car towed back home over night. The car threw a couple check engine codes finally. The only one that stuck out was a failure in the fuel rail pressure sensor. So....I went to a local scrap yard and found a couple new ones. Replaced the old with the new and for a while the car worked with no issues, until today. Got in the car today and boom...would only crank and would not start. I'm absolutely clueless as to whats wrong now. I don't have the money to keep trial and error in different parts so my last option is this forum and possibly if Firestone could run an engine check that might give me some slight information as to whats wrong.
 

T_Roberts

New Member
Dec 8, 2019
27
2
3
21
South Carolina
Hi all, I installed the PA performance alternator from American muscle that has an output of 200 amps. I also purchased the PA performance premium power wire kit to accommodate the bigger load from the alternator. upon installing these items, my battery was reading low on the cars dashboard and under heavy loads, the car would jug. Today, I took it to autozone and had them test the battery and as I pulled into autozone, the cars electronics died and the car jugged and jugged until it was turned off. It would then not turn on until it was jump started so we assumed the battery was bad. I got a new battery and she started right up. He checked my battery and alternator and the car consistently failed the voltage test because it was producing either to high a voltage or too low a voltage. The battery light on the dash stays on but the battery voltage bar stay slightly above halfway. Any reasons why a new alternator would cause this Do I need a bigger battery possibly? Thanks for any help/advice!
Alright. After 3 repair shops and some helpful hints from some people on here I have finally figured out what it was. 2 things were wrong. My subs were wired wrong from the factory and were constantly draining the battery. The mach 460 amps wiring was Intertangled and drew to much power. 2, the fuel pump was bad. After replacing/fixing both. I have solved my issue. My ac compressor clutch was also about to blow its brains out so I changed that out also
 
  • Like
Reactions: McFly2