Battery Light on, voltage dropping

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Oct 21, 2017 | 08:20 AM

cybercop

Thread Starter

Recovery Vehicle

Joined: Dec 2008

Posts: 1,025

Likes: 38

From: North Georgia

Battery Light on, voltage dropping

Battery light came on. Truck Died.

Jumped Truck, Truck Died.

Put new battery in truck.

Battery light still on.

Volt meter on battery shows voltage at battery at 14.15 but dropping. Now in the 13s

Bad Alternator??

Oct 21, 2017 | 08:57 AM

LR03NJ

TReK

Joined: Feb 2009

Posts: 2,186

Likes: 200

From: Linden, NJ

Quote:

Originally Posted by cybercop

YES! Bad alternator.

Oct 21, 2017 | 09:03 AM

aemnky606

Winching

Joined: Feb 2010

Posts: 554

Likes: 59

From: Burlington, NC

X2 on that alternator. Not sure on a d2 but the RPM's will jump like crazy on a d1 when the alternator is dieing. That is also a clue also that it's the alternator.

Oct 23, 2017 | 08:12 PM

cybercop

Thread Starter

Recovery Vehicle

Joined: Dec 2008

Posts: 1,025

Likes: 38

From: North Georgia

Whats the brown and yellow wire for?

Oct 23, 2017 | 08:16 PM

LR03NJ

TReK

Joined: Feb 2009

Posts: 2,186

Likes: 200

From: Linden, NJ

If i remember, there are only 1 thick and 1 thinner wire if its the alternator and it can only be installed to the right size stud on the alternator.

Oct 23, 2017 | 08:44 PM

number9

Pro Wrench

Joined: Nov 2015

Posts: 1,935

Likes: 189

From: Coastal Georgia

Quote:

When the voltage applied to the alternator/generator side of the ignition/no charge warning
lamp exceeds the battery voltage applied to the warning lamp, the lamp is extinguished. This
shows that the alternator/generator is producing battery charging current.

Quote:

Originally Posted by cybercop

Whats the brown and yellow wire for?

Goes to alt light to turn it off when alt voltage higher than battery voltage.

Alt light will remain on if wire not attached.
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