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#4072324 - 07/30/20 06:53 AM Alternator amperage
bbowwler Offline

Registered: 08/29/19
Posts: 11
Loc: NY
2011 PI 4.6 V - When needing to change the alternator, how do you know which amperage to buy ? Thanks

#4072340 - 07/30/20 10:02 AM Re: Alternator amperage [Re: bbowwler]
BigMerc96 Offline

I know nothing
Posting Addict

Registered: 06/05/10
Posts: 19770
Loc: I can see Detroit from here!
Should be a 200a unit if its a police car, sometimes shown as a 220a. Civilian cars used a 135a 6G alternator.

2006 Audi A6 ~132k miles, stock.
1998 Mercury Grand Marquis LS HPP ~100k miles, slowly acquiring modifications.
1997 Town Car Cartier ~145k miles, Ported Plenum, Gutted Airbox, Contour E-fan Retrofit, Dual exhaust with Magnaflows, cats deleted, MSD Ignition, KYB Gas-A-Justs, P71 front bar, air ride reinstated, Projector retrofit, Caddy 4-note horn retrofit, Wood rim steering wheel retrofit, holistic weight reduction as the parts fall off..
1996 Mercury Grand Marquis GS 117,485mi. R.I.P. 7/14/12 frown

#4072446 - 07/31/20 12:55 AM Re: Alternator amperage [Re: bbowwler]
Lance01 Offline

Registered: 04/02/18
Posts: 333
Loc: Pa
In addition to what BigMerc96 said make sure the new or rebuild alternator comes with a decoupler pulley.

#4072452 - 07/31/20 08:43 AM Re: Alternator amperage [Re: bbowwler]
2008interceptor Offline
Over the Hill

Registered: 09/02/02
Posts: 3130
Loc: Pennsylvania
O'Reilly I know sells ones with decouplers mine is a new Odyssey gold, they sell rebuilt also with decoupler. You may want to do the tensioner and belt if they haven't been changed.
2008 Ford Crown Victoria Police Interceptor P71 with street appearance package.


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