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73-87chevytrucks.com
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73-87 Chevy _ GMC Trucks
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Alternator gets too hot to touch
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Topic: Alternator gets too hot to touch (Read 2165 times)
silverchev08@gmail.com
Newbie
Posts: 25
GMC K20
Alternator gets too hot to touch
«
on:
February 23, 2019, 08:12:04 AM »
85 GMC K20 - new alternator - replaced what was installed.
Is it normal for an alternator to heat up to the point where I can't hold my hand on it? I mean the truck seems to be running fine for now. Can also heat bubbling in battery after driving truck for a while. Battery is new as well. Checked amperage at battery terminals while truck is running and display reads 14-15. Any thoughts?
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silverchev08@gmail.com
Newbie
Posts: 25
GMC K20
Re: Alternator gets too hot to touch
«
Reply #1 on:
February 23, 2019, 01:20:02 PM »
Okay one more tidbit of information. While truck was running tested leads with my multi meter and voltage at battery while running is 16.74 . I guess this is obviously way too much and is the reason why the alternator is getting hot it's charging the battery overcapacity. Thoughts?
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Irish_Alley
Tim
Global Moderator
Senior Member
Posts: 13319
Family is not an important thing. It's everything.
Re: Alternator gets too hot to touch
«
Reply #2 on:
February 23, 2019, 01:50:00 PM »
yeah i would say something isnt right with it. does always read 16+ volts? take it back to the parts store so they can bench test it
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If you can’t tell yourself the truth, who can you tell it to?~Irish_Alley
When you have eliminated the impossible, whatever remains, however improbable, must be the truth ~Sherlock Holmes
VileZambonie
Global Moderator
Senior Member
Posts: 19010
Re: Alternator gets too hot to touch
«
Reply #3 on:
February 23, 2019, 05:23:41 PM »
Replace the alternator
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, ___
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74 GMC
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75 K5
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84 GMC
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85 K20
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86 k20
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79 K10
silverchev08@gmail.com
Newbie
Posts: 25
GMC K20
Re: Alternator gets too hot to touch
«
Reply #4 on:
February 23, 2019, 06:59:42 PM »
Its brand new though
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bd
Global Moderator
Senior Member
Posts: 6450
Re: Alternator gets too hot to touch
«
Reply #5 on:
February 23, 2019, 07:30:49 PM »
With the engine running, measure the voltage at the #2 regulator terminal (image) and compare that with the voltage measured at the alternator B+ output post and the battery positive post. Use the same voltmeter ground connection for all three measurements. Then measure the voltage drop between the battery negative post and the alternator case. Post all results.
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Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)
silverchev08@gmail.com
Newbie
Posts: 25
GMC K20
Re: Alternator gets too hot to touch
«
Reply #6 on:
February 24, 2019, 12:37:35 PM »
Started the truck up this morning and battery was being charge to 19 V. Turned off the truck disconnected everything and took the alternator back to Napa and swapped it out. Just installed new alternator and voltage at battery while truck is running is 14.8. Think we're good to go. Anything else I should check?
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JohnnyPopper
Senior Member
Posts: 2548
Old Goof
Re: Alternator gets too hot to touch
«
Reply #7 on:
February 25, 2019, 12:30:30 PM »
One last thing: Is there cold beer in the fridge?
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1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400 Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction
philo_beddoe
Senior Member
Posts: 2736
77 C-10
Re: Alternator gets too hot to touch
«
Reply #8 on:
February 26, 2019, 09:44:25 AM »
Just keep throwing parts at it until fixed. Theoretically, you'll eventually end up with a perfect new running vehicle. Good job...
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Behold, the day of the LORD cometh, and thy spoil shall be divided in the midst of thee. Zechariah 14:1
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Alternator gets too hot to touch