Author Topic: P30 464 Chieftain Alternator Woes  (Read 304 times)

Offline PaulLofthouse

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  • Posts: 7
  • A Brit, in Michigan with a Winnie named Wanda
  • I own: a Motor Home
  • Year: 1986
  • Make: Winnebago
  • Model: Cheiftain 23
  • Chassis: Chevy P30
  • Engine: 464
P30 464 Chieftain Alternator Woes
« on: July 09, 2019, 03:38 PM »

Hi All.


So, just picked up our 86 Winnie, that has 'just' had a new alternator fitted.  Like literally before we drove it home.  Guess what, its not charging.  I don't think the guy had a clue to be honest.


Anyway, true enough, no charge coming from the back of the alternator - its just sat at 12.2.


The new shiny alternator is the 7924 GM, and the old one is the lestek 9135M 105 Amp.


I thought the 7924 was an SI with the regulator built in, but the old lestek was externally regulated...   it looks like the wiring loom has been butchered, and im trying to work out whether the regulator is needed or not.



Am I right?



Thanks everyone!
Paul



Online Rickf1985

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  • Engine: 454
Re: P30 464 Chieftain Alternator Woes
« Reply #1 on: July 09, 2019, 04:41 PM »
The alternator that belongs in there would be internally regulated and would have been a standard GM alternator. The Lestak was an add on as was the regulator if it had one. A Lestak 9135 is a dual output 135 amp alternator that is set up for charging the house batteries on one output and the chassis battery on the other output. The factory wiring may actually still be hiding down in there somewhere for the original alternator.

Offline PaulLofthouse

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  • Posts: 7
  • A Brit, in Michigan with a Winnie named Wanda
  • I own: a Motor Home
  • Year: 1986
  • Make: Winnebago
  • Model: Cheiftain 23
  • Chassis: Chevy P30
  • Engine: 464
Re: P30 464 Chieftain Alternator Woes
« Reply #2 on: July 23, 2019, 05:22 PM »

Thank you!


So, the new Alternator that's in there is a GM 7924. Picture of it installed is attached.  Just for clarification, anyone know if this is internally regulated, or does it need a regulator?


p

Online TerryH

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Re: P30 464 Chieftain Alternator Woes
« Reply #3 on: July 23, 2019, 05:35 PM »
A Brit, in Michigan with a Winnie named Wanda

Sounds 'fishy' to me! :)rotflmao :)rotflmao
If you danced with the devil for a very good reason, have you not still danced with the devil?
Tom Clancy  1947 - 2013

Offline PaulLofthouse

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  • Posts: 7
  • A Brit, in Michigan with a Winnie named Wanda
  • I own: a Motor Home
  • Year: 1986
  • Make: Winnebago
  • Model: Cheiftain 23
  • Chassis: Chevy P30
  • Engine: 464
Re: P30 464 Chieftain Alternator Woes
« Reply #4 on: July 23, 2019, 05:41 PM »

lol -  The missus came up with the name - I promptly had to introduce her to the film :)

Offline PaulLofthouse

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  • Posts: 7
  • A Brit, in Michigan with a Winnie named Wanda
  • I own: a Motor Home
  • Year: 1986
  • Make: Winnebago
  • Model: Cheiftain 23
  • Chassis: Chevy P30
  • Engine: 464
Re: P30 464 Chieftain Alternator Woes
« Reply #5 on: July 23, 2019, 05:59 PM »
Guys, In addition to the above question regarding whether the alternator fitted is an SI unit, or needs a regulator, can anyone tell me what the isolator above the alternator is?

The one in the battery box is operated when the Momentary switch is pressed, is this one pictured operated when the rocker is set to Dual?




Online Rickf1985

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  • Engine: 454
Re: P30 464 Chieftain Alternator Woes
« Reply #6 on: July 23, 2019, 07:14 PM »
Yes, the alternator is internally regulated and there should be a two wire flat plug that goes on that connector on the bottom of the unit. The solenoid is the starter assist solenoid.

Here is a diagram of the alternator where you can see the wires that go to that plug. One is a small brown wire #25 and the other is usually a slightly larger red wire #2. You can rig these up if you have to if you can't find the original plug.


Offline PaulLofthouse

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  • Posts: 7
  • A Brit, in Michigan with a Winnie named Wanda
  • I own: a Motor Home
  • Year: 1986
  • Make: Winnebago
  • Model: Cheiftain 23
  • Chassis: Chevy P30
  • Engine: 464
Re: P30 464 Chieftain Alternator Woes
« Reply #7 on: July 23, 2019, 09:59 PM »
Again,  thank you.


Out of interest,  which manual is that diagram from?


P

Online Rickf1985

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Re: P30 464 Chieftain Alternator Woes
« Reply #8 on: July 24, 2019, 09:36 AM »
1988-ST-350-88 Chevrolet GMC  light truck Wiring manual- Complete.
It is available on the site here but you need to be a full member.

Offline PaulLofthouse

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  • Posts: 7
  • A Brit, in Michigan with a Winnie named Wanda
  • I own: a Motor Home
  • Year: 1986
  • Make: Winnebago
  • Model: Cheiftain 23
  • Chassis: Chevy P30
  • Engine: 464
Re: P30 464 Chieftain Alternator Woes
« Reply #9 on: July 24, 2019, 09:59 AM »
What's the module in the top right corner that the brown wire comes from?


Thanks

Online Rickf1985

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  • Model: Chieftain
  • Chassis: Chevy
  • Engine: 454
Re: P30 464 Chieftain Alternator Woes
« Reply #10 on: July 24, 2019, 03:38 PM »
In the diagram? That is the body connector plug where the engine harness connects to the body harness at the firewall. This diagram was from a pickup truck since it showed a better picture of the alternator wiring. The diagram for the P series only showed a #25 stub and no wiring after that. I wanted to give you an overview of how the wiring interacted with the rest of the unit. You are probably going to have to fab up the wires fr the alternator but it is not hard. The #2 wire just jumps over to the main charging wire an the #25 brown wire hooks into an ignition "ON" circuit to tell the alternator to turn on.


The easier way to do this would have been a one wire alternator used by all of the hot rodders and most people that are upgrading from old system to new. There are no extra wires, just the main charging wire and that is it.


https://www.google.com/search?q=one+wire+alternators&rlz=1C1PRFE_enUS666US695&oq=One+wire+alternators&aqs=chrome.0.0l5.5547j0j8&sourceid=chrome&ie=UTF-8

Offline PaulLofthouse

  • *
  • Posts: 7
  • A Brit, in Michigan with a Winnie named Wanda
  • I own: a Motor Home
  • Year: 1986
  • Make: Winnebago
  • Model: Cheiftain 23
  • Chassis: Chevy P30
  • Engine: 464
Re: P30 464 Chieftain Alternator Woes
« Reply #11 on: July 24, 2019, 03:44 PM »
Excellent,


I'll get on it :)  thank you for your insights!


P

Offline DaveVA78Chieftain

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Re: P30 464 Chieftain Alternator Woes
« Reply #12 on: July 24, 2019, 07:40 PM »
Rick,
That is not the correct page for his setup.  You are showing the one for a LO5 (350ci) engine.  He has a LE9 (454ci) that has the magnetic switch for the starter circuit that he asked about in post #5 (relay mounted on bracket above alternator).  The correct page is Section E, page 3 (pdf page 337).   I have to run out for a while and cannot post the page at the moment.  The magnetic switch is used to ensure enough voltage gets to the solenoid "S" post for engine start when the engine compartment is hot (temp).

Online Rickf1985

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  • Engine: 454
Re: P30 464 Chieftain Alternator Woes
« Reply #13 on: July 24, 2019, 08:08 PM »
Rick,
That is not the correct page for his setup.  You are showing the one for a LO5 (350ci) engine.  He has a LE9 (454ci) that has the magnetic switch for the starter circuit that he asked about in post #5 (relay mounted on bracket above alternator).  The correct page is Section E, page 3 (pdf page 337).   I have to run out for a while and cannot post the page at the moment.  The magnetic switch is used to ensure enough voltage gets to the solenoid "S" post for engine start when the engine compartment is hot (temp).


You are correct Dave, And incorrect. He has the LE8 454. But of you reread my last post I did say that this was for the pickup style of truck since it showed a clearer shot of the alternator wiring. He had asked about the starter solenoid before and I told him what it was back then but this time I am pretty sure he was asking about the block on the diagram and thinking it was a module. The diagram for the LE8 does not show a very good shot of the alternator wiring at all. But here is the one for the LE8 just in case. Now as I say that and look at this diagram this is NOT the LE8 diagram I looked at before!? I have too many diagrams!!! It is late and I will revisit this tomorrow.



Online Rickf1985

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  • Posts: 5486
  • Member since: 2013
  • I own: a Motor Home
  • Year: 1989
  • Make: Winnebago
  • Model: Chieftain
  • Chassis: Chevy
  • Engine: 454
Re: P30 464 Chieftain Alternator Woes
« Reply #14 on: July 24, 2019, 08:15 PM »
Alright, I could not let it go, the last one I posted was from the 1989 manual and this one is from the 1988 manual. The 89 manual does NOT show the starter switch and the 88 manual does show it although they all have it! But note that this one does not show squat for the alternator wiring which is what this was all about to begin with.

NOW I can go to bed. :D


 

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