Pulsating lights - Dodge Cummins Diesel Forum
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post #1 of 18 (permalink) Old 02-12-2018, 07:46 AM Thread Starter
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Pulsating lights

I think I have a bad alternator when I 1st start my truck for about 15 minutes or so all of my lights pulse from brite to dim. Is this sign of a bad regulator in the alternator? It's a 17 Ram 3500 desiel with the single 220 amp alternator

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post #2 of 18 (permalink) Old 02-12-2018, 08:09 AM
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I have a sneaking suspicion that it's just your grid heater cycling... Could you post a video?

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post #3 of 18 (permalink) Old 02-12-2018, 08:47 AM
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Itís your grid heater. Itís normal.


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post #4 of 18 (permalink) Old 02-12-2018, 08:53 AM Thread Starter
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Thanks guys I'll try to upload video tonight after work I can't seem to figure out how to do it on this stupid smartphone
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post #5 of 18 (permalink) Old 02-13-2018, 01:25 PM
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I just had this happen to me this morning. I also noticed a ďclickĒ sound coming from the passenger side dash area whenever it would pulse.
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post #6 of 18 (permalink) Old 02-13-2018, 02:36 PM
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Blah ha ha ha, when i saw the title i was thinking it would be a post from someone asking how to wire up lights that pulsate with music! I was ready to get my torch out.
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post #7 of 18 (permalink) Old 02-13-2018, 09:33 PM Thread Starter
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okay i finally figured it out my phone creates mp4 videos and this program only allows wmv format videos. this taken at 4:30 am Feb 13/2017 and the temp was -17C which is 1 degree F and the truck was not plugged in and was remote started
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File Type: wmv 20180213_054247.wmv (3.86 MB, 30 views)
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post #8 of 18 (permalink) Old 02-13-2018, 09:49 PM
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Again, it's your grid heater.

Some trucks use glow plugs, the Cummins uses a grid intake heater. It pulls a fairly large electrical load, hence the lights dimming when it cycles on and off. Its 100% normal. It's what allows you to start at cold temperatures by heating up the air going into the motor to aid with combustion.

Speed up past 15mph and it should turn off.

If you normally plug it in, then you probably haven't noticed it as it usually doesn't need the grid heater after being plugged in (unless it's extremely cold).
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post #9 of 18 (permalink) Old 02-13-2018, 09:59 PM Thread Starter
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Once Again thank you for all your help...... I've never experienced this before, so its true you can teach an old dog new tricks LOL
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post #10 of 18 (permalink) Old 02-14-2018, 08:22 AM
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Quote:
Originally Posted by Patrickan View Post
Thanks guys I'll try to upload video tonight after work I can't seem to figure out how to do it on this stupid smartphone
Iíve never been able to make it work either. No matter if itís smartphone or computer/laptop. One of the other members suggested that you upload it YouTube and just post the link in here. Thatís what Iíve done in my passed posts. Seems to work better and be less frustrating than trying to figure out how to upload it straight here.
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post #11 of 18 (permalink) Old 02-14-2018, 12:49 PM
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Grid heater. Normal. The click you are hearing is the grid heater relay contacts.

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post #12 of 18 (permalink) Old 04-09-2018, 11:24 AM
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Why would the grid heater cycle after the truck is started?

My truck is doing the same thing. You can also see the voltage drop to 10 volts and then cycle back up to 14 volts when it's clicking. It's starts fine, but then for the first few minutes it cycles as described.

I'm suspecting the alternator.

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