Charging system issues
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Charging system issues
I recently installed 2 Duralast Gold series batteries. Both of them are reading 12.6V but when I start the truck the voltage drops down to 11.5V. So I guess I need a bigger alternator that can charge batteries. The question is: what alternator will give enough current to charge the batteries? 120amps? 140amps? Any help would be greatly appreciated.
Hotshot
Joined: Dec 2003
Posts: 15,368
Likes: 121
From: Stuttgart, Ar
I recently installed 2 Duralast Gold series batteries. Both of them are reading 12.6V but when I start the truck the voltage drops down to 11.5V. So I guess I need a bigger alternator that can charge batteries. The question is: what alternator will give enough current to charge the batteries? 120amps? 140amps? Any help would be greatly appreciated.
Hotshot
Joined: Apr 2010
Posts: 19,055
Likes: 235
From: Saratoga Springs,UT
AGREED^^^^^^^^^^^
AT startup the first minute or so there is a HUGE Amp Draw upto 225amps or so. It does come down into the 140amp range Fast and eventualy settles to around 80amps or so if you have a Stock truck
If you have OEM Alt Odds are High its only a 110amp Alternator PEAK OUTPUT
So at an Idel the OEM Alt basicaly Falls SHort on Amperage
SO this ALL SAID^^^^^^^ its HIGHLY RECOMENDED to Invest into a High Output Alternator and do the Battery Cable UPGRADE
A High Output alternator will Extend the Life of ALL Electronics
BATTERYS
FICM
And so On
I run a 190amp DC Power alternator some of the Best Alternators out there and demand is so High that it may take some time to get it to you
DC Power does NOT Cut Quality to get alternators out the Door either so you can rest assured your getting a TOP of the Line Product
Wiser by FTE
Joined: Jan 2010
Posts: 2,837
Likes: 48
The glow plugs are saturating the output of your stock alternator
.After a brief period, the glow plugs start to cycle off and your voltage rises.
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