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1986 electrical

 
Old 10-07-2018, 03:59 PM
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Default 1986 electrical

Ran tests on alternator: diodes, stator, rectifier mights be issue. If i buy a rebuilt alternator it would have all of these components, right? Also, could that cause my brake lights not to work?
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Old 10-08-2018, 10:04 AM
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Rebuild altanators usually have ever thing to bo look t it on and work. But I high doubt that a bad alt. Is the reason you break lights are not working
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Old 10-08-2018, 10:19 AM
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Why don't you tell us the symptoms you've observed, and we'll tell you what the likely causes are, and what diagnosis to do.

In any case: if the alternator is bad, DON'T replace it with another 1G. Upgrade it to the later 3G, which is vastly more-reliable, and more powerful. The swap is very easy, and similar to what's shown here:


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Old 10-08-2018, 12:38 PM
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Originally Posted by Steve83 View Post
Why don't you tell us the symptoms you've observed, and we'll tell you what the likely causes are, and what diagnosis to do.

In any case: if the alternator is bad, DON'T replace it with another 1G. Upgrade it to the later 3G, which is vastly more-reliable, and more powerful. The swap is very easy, and similar to what's shown here:


(phone app link)

awesome, thanks. is that 3G 70 amp?
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Old 10-08-2018, 03:58 PM
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No, the 3G was never made that small.


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Old 10-08-2018, 05:20 PM
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Originally Posted by Steve83 View Post
No, the 3G was never made that small.


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hmm...all the ones i can find are 70amp or smaller. where can i look to find a 3G alternator?
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Old 10-08-2018, 05:23 PM
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nevermind, found em.

Last edited by Blackdog1986Stepside; 10-08-2018 at 05:27 PM.
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Old 10-08-2018, 11:15 PM
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Junkyard, FTW.


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Old 10-29-2018, 07:59 PM
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Originally Posted by Steve83 View Post
Why don't you tell us the symptoms you've observed, and we'll tell you what the likely causes are, and what diagnosis to do.

In any case: if the alternator is bad, DON'T replace it with another 1G. Upgrade it to the later 3G, which is vastly more-reliable, and more powerful. The swap is very easy, and similar to what's shown here:


(phone app link)
guru, im about to be rebuilding the engine, rewiring entire system, and am looking to have it close to stock with a few minor changes. my truck already has EFI, as i remember asking about easy engine upgrades a while ago and you said that one main, significant change would be switching to efi. since i already have it, do you recommend swapping out old 86 efi for a newer (early 90s) one? i havent seen experienced the EFI on my truck helping at all. given, though, that the previous owner did some wonky stuff with the wiring and messed with the steering column wiring, and seemingly other spots here and there. is my 86 efi model antiquated, and ought i go to a 92 or 93 efi? or should i ditch the efi altogether and carb it back up?
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Old 10-29-2018, 11:05 PM
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Carbs suck, and swapping one on would make the truck illegal on all public roads, regardless of local laws or inspections. It would also reduce its value.

There was no substantial change to the EFI system from '85-96, but a newer engine would almost certainly run better because of all the external improvements (wiring, exhaust, programming, sensors/actuators...). The newest "simple" swap would be an ~'02 Explorer/Mountaineer 5.0L EDIS MAF OBD-II, which is a popular swap among early Broncos. But that's probably more work than you want, so for now, I'd focus on fixing this one's problems. I expect you'll find it runs pretty well when it's running as-designed.
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