Pulsating lights - Diesel Truck Forum - TheDieselGarage.com
Thread Details Posted by ELKHUNTR, this thread has received 3 replies and been viewed 593 times.

 
LinkBack Thread Tools Display Modes
post #1 of 4 (permalink) Old 01-01-2007, 04:15 PM Thread Starter
Senior Member
 
Join Date: Jul 2006
Posts: 112
Points: 1,782
Thanks: 0
Thanked 1 Time in 1 Post
Pulsating lights

I have a pulsating light issue, dome lights, head lights dash all of them. My truck is a factory dual alternator and both are working fine, I find I can load the charging system with all available accessories and it does not get better or worse, Ac, fan on high all lights on, stereo with two huge amps cranked up. I put a meter on the truck and get about a 3/10th volt pulse approx. 14.5-14.7 or so at the alt post or battery post but the lights really go to town, lights off no pulse.

There were two other guys with the same problem on another forum with the same issue both single Alt. trucks, but never learned any more. One more point, this problem is at least 8 months and 11,000 miles since first noticed and RPMs dont seem to make a big difference (very Subtle).

Anyone out there run into this before?

Thanks,
Josh

Josh

2000 F350 PSD CC 4X4 AT LWB 3.73s 173,000AFE STAGE I, TN.BB, EIS 200CC HYBRIDS F5 DP TUNER 4" TURBO BACK, AEROTURBINE 4040XL, 5" STACKS, ISSPRO GAUGES,PRE AND POST TURBO PYRO, SCANGAUGE.
ELKHUNTR is offline  
Sponsored Links
Advertisement
 
post #2 of 4 (permalink) Old 01-01-2007, 04:30 PM
Senior Member
 
Diesel Dog's Avatar
 
Join Date: Dec 2008
Location: N.E. Mississippi
Posts: 4,024
Points: 45,600
Thanks: 84
Thanked 24 Times in 22 Posts
I have pulsating headlights after hitting a large bump. I need to check for loose connections and grounds. Your issue sounds to me like a bad voltage regulator. I have dual alts too, but am not sure how the voltage regulator is set up. (one in each alt or one external)

'00 cc f 350 a few mods, and a bts tranny.

Wet concrete, Hot Asphalt And Life Wait for no one
Diesel Dog is offline  
post #3 of 4 (permalink) Old 01-01-2007, 05:53 PM
Super Moderator
 
John_G's Avatar
 
Join Date: Dec 2008
Location: Tyler, TX
Posts: 4,247
Points: 74,597
Thanks: 101
Thanked 407 Times in 347 Posts
I agree with the voltage regulator being bad. But you have TWO, and the question is, which one.

Disconnect the regulator wire (quick connect) on the easiest one to reach, that will disable that alternator. If the problem still exists, it is the OTHER one at fault. Obviously, if it is now fixed, you found the culprit.

BTW, the regulators can be replaced inexpensively in your garage, if you can change oil, you can do this and save $250 on a "rebuilt" alternator.

If you decide because of time, mileage, or use that you should have a rebilt replacement, I STRONGLY suggest you look in the phone book for a LOCAL rebuilder (most auto machine shops can do this, or tell you where), and use them. It will NOT cost you more $$, and you get a better product.

'93 F-250 HD, 7.3L IDI, 5spd - FARM TRUCK
I Support: Trailer brakes an every axle over the towing vehicle's GVW; CDLs for RVers; Safety inspections for ALL vehicles and 6 axle trucks (97K GVW proposal).

Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote - Benjamin Franklin

I vote for LIBERTY!
John_G is offline  
post #4 of 4 (permalink) Old 01-01-2007, 08:23 PM Thread Starter
Senior Member
Threadstarter
 
Join Date: Jul 2006
Posts: 112
Points: 1,782
Thanks: 0
Thanked 1 Time in 1 Post
Thanks JohnG, I will check it tomorrow while I am under the hood changing my GPR that convenently gave out on me today.

Josh

2000 F350 PSD CC 4X4 AT LWB 3.73s 173,000AFE STAGE I, TN.BB, EIS 200CC HYBRIDS F5 DP TUNER 4" TURBO BACK, AEROTURBINE 4040XL, 5" STACKS, ISSPRO GAUGES,PRE AND POST TURBO PYRO, SCANGAUGE.
ELKHUNTR is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Diesel Truck Forum - TheDieselGarage.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome