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09-16-2021, 08:09 PM
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#1
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Senior Member
Join Date: May 2016
Location: Prescott Az.
Posts: 329
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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.
I’m concerned about the alternator after reading about a rig sticking in gear because of low voltage. Any thoughts? Thanks
__________________
Pat and Shelley C.
Prescott Valley Az.
2007 H R Endeavor 40 PDQ, 2023 Colorado Z71
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09-16-2021, 08:32 PM
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#2
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,269
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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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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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09-16-2021, 09:08 PM
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#3
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Senior Member
Join Date: Jul 2014
Posts: 35,317
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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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09-17-2021, 06:55 AM
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#4
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Senior Member
Join Date: May 2016
Location: Prescott Az.
Posts: 329
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Thank you guys that makes since. I feel better now. I didn’t realize those heaters existed and I should.
Prescott does get well below 50’s. Lol. Lots of snow in the wintertime, and plenty of pine trees up here. The dessert I know right, but don’t tell anyone,
Thnx again I appreciate it.
__________________
Pat and Shelley C.
Prescott Valley Az.
2007 H R Endeavor 40 PDQ, 2023 Colorado Z71
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09-17-2021, 07:01 AM
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#5
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Senior Member
Join Date: May 2016
Location: Prescott Az.
Posts: 329
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Oops forgot to answer your question, yes I do get the wait to start light. Now that I don’t need to replace the alternator I’m going to order the larger Bilstein shocks, thnx again
__________________
Pat and Shelley C.
Prescott Valley Az.
2007 H R Endeavor 40 PDQ, 2023 Colorado Z71
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09-18-2021, 07:47 AM
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#6
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Senior Member
Join Date: Jun 2011
Location: FL
Posts: 11,386
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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.
__________________
Certified Senior Electronic Technician, Telecommunications Engineer, Telecommunications repair Service Center Owner, Original owner HR 2008
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