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Old 09-16-2021, 08:09 PM   #1
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Alternator drops then okay

Hello all, 07 Endeavor 400 isl, for about a year when I first start up the rig the alternator drop 2-3 volts for a second or two then back to its normal range. Does this about 2-3 times. After that it stays in the normal range and never drops.

On a trip a few months ago, the headlights turned on by themselves while driving, I had to turn the switch on then off. They can back on and in the bright selection, had to turn on/off several times.

Took it out a month ago and no issues with the lights coming on. My radio back light stayed lit and the stereo would not work. I turned off my batt disconnect and that reset the radio. Works good.

Iím concerned about the alternator after reading about a rig sticking in gear because of low voltage. Any thoughts? Thanks
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Old 09-16-2021, 08:32 PM   #2
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Ok alternator voltage reading dropping after start up .
Sounds like the engine grid heaters cycling .

Are you getting a " Wait to Start " light before cranking the engine .
Grid heaters will cycle, when cold starting in temps below approx 50 f . and not after the engine warms up or in warmer ambient temps.

But I wouldn't expect Prescott to see those temps frequently.
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Old 09-16-2021, 09:08 PM   #3
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The intake grid heaters cycle at any cold start. They do that to warm the intake air which limits startup smoke.

That cycling will cause the voltage meter to cycle up and down for a minute or so.
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Old 09-17-2021, 06:55 AM   #4
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Thank you guys that makes since. I feel better now. I didnít realize those heaters existed and I should.

Prescott does get well below 50ís. Lol. Lots of snow in the wintertime, and plenty of pine trees up here. The dessert I know right, but donít tell anyone,

Thnx again I appreciate it.
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Old 09-17-2021, 07:01 AM   #5
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Oops forgot to answer your question, yes I do get the wait to start light. Now that I donít need to replace the alternator Iím going to order the larger Bilstein shocks, thnx again
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Old 09-18-2021, 07:47 AM   #6
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Yep, grid heaters. Big note near mine warning about NOT using starting fluids. Kaboom.

Those heaters draw a tremendous amount of power. The glow plugs on the generator draw quite a bit too but that is a different story. Just useless information for now.
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