high voltage
Thread Starter
|
Freshman User
Joined: Dec 2003
Posts: 34
Likes: 0
From: Kennewick, WA
high voltage
This is probably a simple problem but so unsure. 2000 7.3 started and all is good at idle. Accelerate to 1500 RMPS and alternator light comes on and volt meter shows near full scale. Pulled back in to garage and checked with real meter. With engine off 12.3 volts. Start and at idle 12.8 volts. but when RPMs go up the volts at battery do the same. I got 18.3. If I put headlights and fan on full the light comes on about 1800 RMPs.
Replace alternator or is it a battery problem or something else?
Replace alternator or is it a battery problem or something else?
Moderator
Joined: Jan 2001
Posts: 56,992
Likes: 2,741
From: Virginia
Make sure your wires to the alternator are good. There is usually one(yellow/white?) that leaves the alternator and is the wire the internal regulator uses to sample the voltage in the truck's wiring. If this wire is broken the regulator will lose it's reference voltage and may go wild.
Thread
Thread Starter
Forum
Replies
Last Post
jdwxly
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
13
Sep 23, 2019 09:52 PM
hillbillyjunkie
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
3
Nov 28, 2009 11:57 PM
DIRTYSTEVEN
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
2
Feb 17, 2008 10:14 PM
