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-   -   Pulsating lights (https://www.cumminsforum.com/forum/89-93-non-powertrain/2496331-pulsating-lights.html)

Those_cummins 03-21-2019 08:22 PM

Pulsating lights
 
I have had pulsating light on this truck for a long time now. All lights pulsate even the buzzer cuts in and out. I thought a new alternator may help, but it only made it more noticeable. The only time the lights don’t flash is when the grid heater cycles, due to the draw, I think. Have any of you had any similar problems? I’ve added a few grounds with no luck. Any help would be appreciated!

9297oldram 03-21-2019 09:28 PM

What year is your truck and do you have a external regulator on it?

Those_cummins 03-21-2019 11:24 PM

I once added an external voltage regulator and it only made the truck not charge, but the lights didn’t flicker. She’s a 93

KATOOM 03-21-2019 11:55 PM

The alternator voltage is regulated by the PCM. Flickering headlights are usually a telltale sign of a bad rectifier in the alternator.

9297oldram 03-22-2019 08:29 AM

You can't add a external regulator to a truck that the charging is controlled by the ECM unless you cut the 2 field wires off the alternator. Then you run new wires from the external regulator to the alternator.

Those_cummins 03-22-2019 08:48 AM

I shorted out the pcm a long time ago, every else is working mostly as it should. When I added the external regulator, I made my own field wires. I used a dodge external regulator and corresponding pig tail. It made the truck not charge, but the lights didn’t flicker. Maybe I didn’t do the field wires correctly.

9297oldram 03-22-2019 04:49 PM

Quote:

Originally Posted by Those_cummins (Post 28934511)
I shorted out the pcm a long time ago, every else is working mostly as it should. When I added the external regulator, I made my own field wires. I used a dodge external regulator and corresponding pig tail. It made the truck not charge, but the lights didnít flicker. Maybe I didnít do the field wires correctly.

Did you run a key on hot wire to one of the wires at the regulator? Was the regulator grounded good?

Another option would be a 1 wire alternator from https://www.paperformance.com/136a-d...1-wire-2227se/

Those_cummins 03-22-2019 07:18 PM

Yes, and I grounded it both to the firewall and alternator itself

9297oldram 03-22-2019 08:44 PM

Quote:

Originally Posted by Those_cummins (Post 28934999)
Yes, and I grounded it both to the firewall and alternator itself

Should have worked then did the same on my Blazer only I used this regulator, https://store.alternatorparts.com/pa...iABEgLUhPD_BwE . The first one I had on it made my lights blink so I replaced it with the adjustable one.

Those_cummins 03-24-2019 10:04 PM

Ok, sorry for not responding. So I went out and bought another voltage regulator. Same lick. This time; however,I decide instead of hooking the regulator to both of the exciter poles and a 12v accessory, but straight to the battery. This worked. But the question is are there any drawbacks or reasons I shouldn’t hook it directly to the battery?

9297oldram 03-25-2019 09:15 AM

If you don't use a key on wire and go straight to the battery you'll drain your battery down when it isn't running. Most will use a relay and pull battery volts to the regulator so that it still turns on and off with the ign key.

Those_cummins 03-25-2019 11:11 AM

That’s what I did in the beginning, I use 12v accessory from the relay closest to the firewall. Pretty sure its a blue wire. But going straight to the battery is fine, especially if I add a toggle switch under the dash to cut power when not in use?


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