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94 s 10 blazer voltage range
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dragtime92
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Apr 5, 2009, 5:53 PM
Post #1 of 10
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94 s 10 blazer voltage range
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ok well simple as this... why would the voltage range be almost on 19 which is out of range suppose to read round the 14's rite??? but when i turn my heater on it will go down to bout 15 17 somewhere in that range which would normally be closer to where its suppose to be rite i have some sensors out i know that and im told to replace the o2 sensor and all which that came up 1st so will probably replace 1st then i get the reading of voltage outta range which is why im asking the question on wh why its reading low 18's 19's any suggestions would help ????
(This post was edited by dazed92 on Apr 5, 2009, 6:55 PM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Apr 5, 2009, 7:18 PM
Post #2 of 10
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Re: 94 s 10 blazer voltage range
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Make sure that voltage reading device is correct on another vehicle if need be. Range while running should show mid 13s to mid 14s. Much over 15 isn't right and this 19 will start damaging things!
I think about all this vintage GMs put the voltage regulator inside the alternator. That about has to be the fault. They can be installed separately or do come with a replacement alternator. Check on prices - sometimes they cost so damn much the whole unit is the better deal,
T
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dragtime92
User
Apr 5, 2009, 7:40 PM
Post #3 of 10
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Re: 94 s 10 blazer voltage range
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so let me make sure this is what ur saying it is in fact the alternator that is the problem ??? cuz it does read almost 19's but as long as i keep my heater on hi and keep it down lower round the 14's 15's... will keep ot from ruining things
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Apr 5, 2009, 8:40 PM
Post #4 of 10
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Re: 94 s 10 blazer voltage range
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Ya - Basically the alternator in an unbridled horse and will keep going without being regulated so about the only thing that can allow voltage to exceed ~15v EVER is the regulator. If you tax its ability with everything on it would show lower unless amp rating of the alt could overcome that with some RPMs to help it to max out.
It's a gizmo like this inside the alt the regulates it. There is a chance if it's grounded in a certain way it would bypass this and be unbridled if you will to make all the volts it could till it blew up. This high voltage will blow light bulbs and mess up puter controls no doubt too. Dash bulbs are weak to be "over volted" and a real pest to replace!
Thing if you know how to take the body of an alternator apart and restrain the brushes isn't way too hard to replace. Just looked - this item is about $36 bucks and whole alternator about $155 + deposit and tax of course.
The regulator is doable for a DIYer who is willing and a brew or two
Note the three body bolts on the alternator shown. With those indexed so plugs will be where you want them with them undone the body will split apart - spring loaded brushes will fall out if not restrained or restrain them later with a paper clips (just laughs - does anyone use paper clips for paper anymore?) with sneaky little holes to do such it goes back together right the way it was if nothing important flew across your work area
Been a while - you may need to remove pulley - air is best for that and don't vice grip the pulley to hold it!
If you have some time - many parts places will bench test it for you. It needs a machine and you ground it to bypass the regulator so it may not be conclusive. I plain forgot how to force full voltage - something like grounding the "field terminal" on some which bypasses the regulator. If you want - and think you want to give this a try - take yours apart and if it fails or messes you up just trade it in for new or rebuilt.
Not this case but bearings are replaceable too. Way too many alts get tossed for a silly bearing. I'm gettin old man but a bearing should be marked and can be cross referenced and used to cost like $12 bucks or so. Those days are fading - regulator is still available separately for this one though,
T
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dragtime92
User
Apr 9, 2009, 8:40 AM
Post #5 of 10
(1266 views)
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Re: 94 s 10 blazer voltage range
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ok well were just getting a used alternator not expensive either bout 30$ not bad i dont think as long as it fits and the plugs fit rite on it and mounts up it will workk wont it (what are some other cars or trucks that will have an alternator that will fit in this blazer 4.3L CPI Engine)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Apr 9, 2009, 11:01 AM
Post #6 of 10
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Re: 94 s 10 blazer voltage range
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$30 bucks is great! Hope you get to keep your old one to practice on - nothing serious to lose.
Look back at the pic of an alt that might be exactly as yours. The body could be assembled in three different positions in that one and would be for different locations on several models. The only real thing that matters is that it is the same so wires hook up properly and don't stretch or rub something if it was off. If they have one AND it's wrong let them "re-clock" it and make that note that THEY did it so you don't get blamed if that one fails.
The plug shape and style must match and look at the pulley also. That can be switched if not just like your original - again let them do that or it's easy -- best with an air wrench CAREFULLY not to bend anything or rattle it senseless!
Good luck. There's a high chance this is the whole issue. Get a silly voltmeter or multimeter so you can quickly read the real voltages direct at battery terminals,
T
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dragtime92
User
Apr 9, 2009, 2:50 PM
Post #7 of 10
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Re: 94 s 10 blazer voltage range
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ok well we took it to auto zone they ran a test on it said it passed and even whatched it say pass on it so its not the alternator could it be the gauge has possible gone bad on it
???? they didnt have one
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Apr 9, 2009, 2:59 PM
Post #8 of 10
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Re: 94 s 10 blazer voltage range
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If it tests ok it might be and gauge is wrong. AutoZone sells a voltmeter that just plugs into a cig lighter or power port and reads the voltage for about $12 bucks.
WalMart has a cheap and a better multimeter for $9.96 on up. The cheapo is hard to see exact voltage.
The only thing I can think of if you see voltages of higher than norms is a voltage regulator OR perhaps a wire in your harness by passes it to allow for unleashed outputs and I'm lost to suggest which wire could do that??
T
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dragtime92
User
Apr 10, 2009, 5:56 AM
Post #9 of 10
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Re: 94 s 10 blazer voltage range
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ok well thanxs on everything on this issue we are just going with the gauge is wrong on it... cuz the P R N OD D 2 1 its of to when in park ur in park in R it backs up but in N the reverse lites come on BUT in N OD D 2 1 ot all drives but thats it so im guessing its the gauges ....
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Loren Champlain Sr
Veteran
/ Moderator
Apr 10, 2009, 4:13 PM
Post #10 of 10
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Re: 94 s 10 blazer voltage range
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PRNDL indicator would sure affect charging voltage! NOT. dazed2, you ask all these questions, we give you things to check, and you ignore them, just ask more questions. We're here to try and help...on our own time, unpaid volunteers. But, you gotta meet us half way.
Loren
SW Washington
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