Voltage drops when running lots of accessories
89 F150 lariat xlt here. I recently fixed the ac/heat and I've noticed at night if I have the headlights on, the ac, and maybe a blinker or windshield wipers or whatever the voltage will drop significantly and the truck will even die at a red light or whatever unless I give it some gas. I'm thinking maybe I need a better battery but I thought I would throw it out to the hive mind and maybe there's another reason for the voltage drop. Thanks ya'll.
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Check the battery voltage - should be 12.5 or 12.6 off. If it is, the battery should be good. Then turn the engine on and test the battery agsin when it’s running. Should be at least 14. If it’s under that, your alternator might not be working right. |
Keep in mind the factory 2G alternator puts out very little to no power at idle/low RPMs. That's a design flaw. Highly suggest you upgrade to a 3G to fix your current issue and prevent the flamethrower 2G from claiming another victim.
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So I just checked the battery with a voltmeter and I got 12.6 and when I start the truck I've got 14+ so I don't think it's the battery. Must be the 2G alternator. I'm looking on Napa's website now and I don't see them labeled as 2g or 3g so I'll give them a call and figure it out. Thanks ya'll.
Napa alternators |
The factory replacement alternators listed for your truck are all 2G design. Everything you wanted to know about the 3G upgrade: https://www.fullsizebronco.com/forum...ins-agian.html
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Originally Posted by rla2005
(Post 18205321)
The factory replacement alternators listed for your truck are all 2G design. Everything you wanted to know about the 3G upgrade: https://www.fullsizebronco.com/forum...ins-agian.html
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Order an alternator for one of these:
(1994-95) Ford Mustang 5.0L (1994-00) Ford Mustang 3.8L (1994-97) Ford Thunderbird, Mercury Cougar 3.8L (1990-95) Ford Taurus, Mercury Sable 3.8L (1993-99) Ford Taurus, Mercury Sable 3.0L (1995-98) Ford Windstar 3.8L & 3.0L (1991-94) Lincoln Continental 3.8L |
Do the 3G upgrade, totally worth it. Installed a 95 mustang v6 alternator rated at 130 amps. You gotta use an angle grinder to cut the bracket slightly to make it fit and fabricate wiring but it's not that bad. I was very impressed with the results.
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Originally Posted by Da_Lariat_Chariot
(Post 18205497)
Do the 3G upgrade, totally worth it. Installed a 95 mustang v6 alternator rated at 130 amps. You gotta use an angle grinder to cut the bracket slightly to make it fit and fabricate wiring but it's not that bad. I was very impressed with the results.
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95 Mustang alternator is $168.00 at Napa.... yikes Napa Any way to field test an alternator at the junkyard? I wouldn't generally buy a junkyard alternator but in this case....
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I bought mine from a guy who was replacing the V-6 with a V-8 to build a race car. I think I paid $30.
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Originally Posted by whisler
(Post 18206793)
I bought mine from a guy who was replacing the V-6 with a V-8 to build a race car. I think I paid $30.
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Soooo, when did they start putting 3G in F-250? I currently have a 91, that I am rebuilding, wondering about this upgrade.
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Originally Posted by puppyf250
(Post 18207504)
Soooo, when did they start putting 3G in F-250? I currently have a 91, that I am rebuilding, wondering about this upgrade.
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