82mazdarx7

I was testing my alternator the other day and it was at 42 amps or volts, not sure which one. But I know that is a little low considering the sound system I have in my car. Its a rebuilt alternator and I have gone through 5 of them. And My shop teacher said maybe it would be good to but a bigger alternator on, maybe one that puts out 150 amps/volts?

So I am just wondering if any of you guys know of a bigger alternator that would bolt in without too much modification. Thanks

O 16581 72452 5

What does your volt gauge read inside your car? it should read around 14 volts when moving.

82mazdarx7

well when the engine is warm it shows about 13, 12.5 when the engine is cold. Like I said its a rebuilt alternator so it could be that but it would be nice to have a little more power

RotorMotorDriver

iTrader: (1)

While moving? Hell, mine reads 14 volts at an idle. Its my 2nd new alternator. Voltage regulator went out in the first one.

~T.J.

82mazdarx7

you have any suggestions on a bigger alternator. The one I got was from napa and its a rebuilt, I know its not as strong as a new one but I dont have the money for a new one. Let me ask you though where did you get your new one, or is a rebuilt

680RWHP12A

get one from a 91 motor .they are 80 amps !! and they bolt up the same! $30.00 plus shipping and its yours , and it warrantied too! i have a system in one of my cars, i had the same problem! the 80 amp alt fixed it!

RotorMotorDriver

iTrader: (1)

Mine is a rebuilt stock replacement with a lifetime warranty .

~T.J.

CHEF_EG_1

ok.... I got a question about alternators...


I'm going to be converting the headlights from sealed beam to H3/H4 replaceables, and then to true H.I.D.

I'm also going to be running true H.I.D. fogs.

There will also be some serious audio/video being run off of this.

Will an Optima Yellow Top and this 80Amp alternator be enough? Or do I need to try and find something that's more along the lines of the 150amp ones that the Big Block Chevy guys run?

680RWHP12A

no the optima and the 80 should be enough for what you want to do!
TJ has the right idea though, lifetime warranty, you cant beat that!

SoRRoW

680RWHP12A


You failed to let them know the plugs are not the same,


On BOTH of my 7s I want to polish out the alts,and have this local shop rebuild the alt for 100 amps,

I dotn think you will need 150.My dam Caddy dont take 150 and Its loaded with power.

82transam

iTrader: (18)

Yea, i have a 89 80 amp alt in my car, its a big help, sound system and black magic fan put quite a load on the electricla system. works great, and its basically a bolt in. If your gonna swap to the 89-91 type you will need the plug, as its different, but its like a 20 minute job, if that.

SoRRoW

Can you buy the pig tail from the store?

cveklund

Hey 680, how many alts do you have for sale and how much shipped to 77573?

Chris

82mazdarx7

I went to the wrecking yard today at got a alternator off a 86 rx7, does it seem like it will work? Do all the second gen alternators put out the same output?

82transam

iTrader: (18)

no, the 86-88 ones are like 70 amps, but they will go right in, and use the same plug. the 89-91 are 80 amps but require changing the plug.

MIKE-P-28

iTrader: (1)

going back to your orginal post, it would be 42 amps, not volts, 42 volts and there wouldnt be anything eletronic in your car still functioning, including light bulbs

MIKE-P-28

iTrader: (1)

dunno where you got it from, but if you get a starter or alternator from autozone/advance or whereever, you will need the lifetime warranty, youd be replacing them all the time.... I have zero faith in there rebuilt stuff anymore, maybe they are better than they used to be but 4 starters in 3 months? took it back got my money back, went to junkyard and got a starter had a local guy do the rebuild, and guess what it still works 4 years later, its now on my 88 vert...

mar3

iTrader: (8)

Oh, how could I have missed this??

The Ultimate Alternator Upgrade Thread....

justrx8

hey are the alternator from 89 to 91 fit a 1984 gsl 12a

RotorMotorDriver

iTrader: (1)

B&B, and Ive alredy had to get two others cause the voltage regulators keep going out in em. This is my thrid, and I think I need a new one again . My voltage is dropping below 12 volts at an idle again, and I just got a brand new battery hoping that would solve it (see electrical system upgrade question thread)

~T.J.

mar3

iTrader: (8)

Did you follow the directions EXACTLY? I've done this conversion only once and it lasted YEARS with a USED alternator. Sometimes buying cheap gets you exactly what you pay for, too............

mar3

iTrader: (8)

yes...read the link.......

82transam

iTrader: (18)

mwhahahaha my thread is back yet again I did my swap in like june and here it is march and its still going along just fine with the fuseable links still in tact. I've yet to run a larger gauge wire from the battery to the fuseable links as it specifys in that thread. Doens't seem to be any problems, but I do plan on running something (probably 10ga) when I replace my battery cables next weekend.

Manntis

Where does one get a reliable 80 amp alt at this price?

mar3

iTrader: (8)

From robert, obviously....he's pitching us, right then.....shamelessly too, I might add...mine was used, too, and it was great right up to the accident...