Starter hanging
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Cross-Country
Joined: Mar 2022
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Part of the problem was the start wire from key switch was on wrong post on solenoid, which cured the starter engaging when the key was turned just to the on position. As far as the starter hanging in, have not gone any farther yet.
Lead Driver
Joined: Jul 2017
Posts: 9,606
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From: San Jose, CA
Thanks for the update. Good to know about at least one aspect. Kind of hard to tell, when both wires are Brown(ish) looking!
Did it turn out both were the same color, or was the old Red w/blue wire there, but faded almost into obvlivion?
Many of our wires are still surprisingly colorful. But over the years many of them have faded into obscurity.
Paul
Did it turn out both were the same color, or was the old Red w/blue wire there, but faded almost into obvlivion?
Many of our wires are still surprisingly colorful. But over the years many of them have faded into obscurity.
Paul
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Cross-Country
Joined: Mar 2022
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Started it. Starter still hanging in when running. Is there a spring pushed gear to engage the flywheel when the solenoid connects the starter? If I take the positive terminal off the battery, the starter disengages. Also, is there a wiring diagram for the 1977 f750 somewhere showing the dash wiring? The PO really butchered some of the ignition/keyswitch wiring.
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Cross-Country
Joined: Mar 2022
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Turns out it isn't the starter that is hanging in. Once started, in about 5 seconds the alternator starts making the racket. My guess is it starts trying to charge, or the bearing is heating up or something like that. Is there an easy replacement alternator, or do I have to go to the newer connector type? Thnx.
Lead Driver
Joined: Jul 2017
Posts: 9,606
Likes: 1,175
From: San Jose, CA
First, check the belt for tightness.
Try tightening it up just a little bit more maybe, just to see if the noise changes or goes away.
The biggest noise maker of an alternator is usually the belt squealing in the pulley. Of course the bearings can go out to as well, and that’s what’s happened to most of my alternators long before they would fail electrically.
This is a grinding, howling, rough sound, rather than a squealing though. Is the noise like a squeal, a chirp, a sandy, or a gravelly sound?
You can literally replace just the bearing from parts that most auto parts stores have in stock.
if you don’t want to replace just a bearing, the alternator for your truck is absolutely still available from any normal auto parts store without having to change any connectors.
However, they did use slight variations of the terminal locations on the back of the alternators over the years, and sometimes those first designs disappear in favor of the later designs, and your wiring connections on the back might have to be bent a little, stretched a little, or yes, possibly replaced.
However, I don’t think I’ve heard of many that had to be replaced unless they were compromised already.
Try tightening it up just a little bit more maybe, just to see if the noise changes or goes away.
The biggest noise maker of an alternator is usually the belt squealing in the pulley. Of course the bearings can go out to as well, and that’s what’s happened to most of my alternators long before they would fail electrically.
This is a grinding, howling, rough sound, rather than a squealing though. Is the noise like a squeal, a chirp, a sandy, or a gravelly sound?
You can literally replace just the bearing from parts that most auto parts stores have in stock.
if you don’t want to replace just a bearing, the alternator for your truck is absolutely still available from any normal auto parts store without having to change any connectors.
However, they did use slight variations of the terminal locations on the back of the alternators over the years, and sometimes those first designs disappear in favor of the later designs, and your wiring connections on the back might have to be bent a little, stretched a little, or yes, possibly replaced.
However, I don’t think I’ve heard of many that had to be replaced unless they were compromised already.
Lead Driver
Joined: Jul 2017
Posts: 9,606
Likes: 1,175
From: San Jose, CA
When you get down to the bearings, there is usually a part number stamped in the edge of the outer race.
Unfortunately, sometimes that’s the side that’s invisible pressed into the casting. But if you’re lucky, you can find the number even before you pull the old one out.
Unfortunately, sometimes that’s the side that’s invisible pressed into the casting. But if you’re lucky, you can find the number even before you pull the old one out.
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Take a l2 foot piece of hoe handle or similar wood, hold one end next to your good ear, and carefully while avoiding moving parts, place the other end against the alternator housing. If a bearing, etc ... you'll soon know. Carefully!
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Cross-Country
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Thanks for your help. Before I pulled it, I tightened the dual belts. Seems to have stopped the noise. Why would it start quiet, then start making noise after 5 seconds or so? We'll see how long it lasts. Thanks again.
Lead Driver
Joined: Jul 2017
Posts: 9,606
Likes: 1,175
From: San Jose, CA
Not exactly sure what the dynamics are that dictate when the squeal starts.
Usually if it’s a belt, it starts within a second or two. Worse in the morning around here with moisture on the belt helping a little slippage.
Perhaps your alternator starts a little slow or there’s some resistance in the system that creates a circumstance that causes the regulator to not tell the alternator to put out for power until a few seconds have gone by.
No real idea obviously. But the more the load while it’s charging the battery the more prevalent the squeal.
It should go away when everything’s in good shape and the battery is fully charged.
Once the battery is charged, the load on the alternator is minimized. When everything is working and the battery just needed to give a quick start, the squealing on mine went away within less than 10 seconds. But I’ve had some vehicles where they were really charging. The battery in the belt was just not getting a good grip on the pool and it would squeal almost constantly for five or 10 minutes.
Usually if it’s a belt, it starts within a second or two. Worse in the morning around here with moisture on the belt helping a little slippage.
Perhaps your alternator starts a little slow or there’s some resistance in the system that creates a circumstance that causes the regulator to not tell the alternator to put out for power until a few seconds have gone by.
No real idea obviously. But the more the load while it’s charging the battery the more prevalent the squeal.
It should go away when everything’s in good shape and the battery is fully charged.
Once the battery is charged, the load on the alternator is minimized. When everything is working and the battery just needed to give a quick start, the squealing on mine went away within less than 10 seconds. But I’ve had some vehicles where they were really charging. The battery in the belt was just not getting a good grip on the pool and it would squeal almost constantly for five or 10 minutes.
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