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Alternator or Battery?

 
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Old 11-08-2011, 01:50 AM
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Alternator or Battery?

Hey guys first post here. I have an 88 prelude. I just replaced my alternator and belts. While driving home, my lights dimmed and car lost power. After pulling on the side of the road the lights came back on bright and it ran for another 5 minutes and the lights went dim again. After i turned the car off for 20-30 minutes, the car turned on fine. What could it be?
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Old 11-08-2011, 02:36 AM
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Re: Alternator or Battery?

Gotta get a voltmeter and put it on the big fat terminal on the alternator while running. Not the battery. It should be slightly over 13 volts.If that's good then your alt is working and you have a problem with a bad battery or battery not getting good contacts from the two cables going to it.
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Old 11-08-2011, 09:46 AM
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Re: Alternator or Battery?

well one way to check the alternator is turn on the car and unplug the battery, do the positive side for more fun lol. If it runs when the batteries disconnected your good on the alternator, if not well then you installed a pos one. btw, the stock alternator in the lude is a pos anyways
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Old 11-08-2011, 09:56 AM
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Re: Alternator or Battery?

check your ground wire on your battery. check both ends for good conections
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In 1987, Road & Track published a test summary that shows the 1988 Honda Prelude 2.0Si 4WS outperforming every car of that year on the Slalom, including all Lamborghinis, Ferraris, and Porsches. It went through the slalom at 65.5 mph (105.4 km/h), an amazing result for the time. For reference, the 1988 Corvette took the same course at 64.9 mph (104.4 km/h).
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Old 11-08-2011, 10:59 AM
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Re: Alternator or Battery?

OP Just take it to a shop, vatozone, or my preferred place O rielies and Kragen. They will test it for you. Hell battery depo's will do it for you.

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Originally Posted by itsdatoneguy View Post
well one way to check the alternator is turn on the car and unplug the battery, do the positive side for more fun lol. If it runs when the batteries disconnected your good on the alternator, if not well then you installed a pos one. btw, the stock alternator in the lude is a pos anyways
I believe that damages the electronics?

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check your ground wire on your battery. check both ends for good conections
Oh god, Jared, your signature is growing with quotes. Please don't be SH DRIVER.
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Old 11-08-2011, 11:02 AM
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Re: Alternator or Battery?

nah it wont damage electronics, your fine
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Old 11-08-2011, 03:06 PM
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Re: Alternator or Battery?

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Originally Posted by Jared View Post
check your ground wire on your battery. check both ends for good conections
^^I would suspect this. It's pretty common for corroded battery terminals to cause starting problems when the weather starts to turn cold. But take it to any parts store and they'll test your system for you for free while you wait.
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Old 11-10-2011, 01:13 AM
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Re: Alternator or Battery?

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Originally Posted by JoshuaaXD View Post
Oh god, Jared, your signature is growing with quotes. Please don't be SH DRIVER.
lol i just came across that and thought it was pretty cool. not many people know that little fact about these old hondas
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^^I would suspect this. It's pretty common for corroded battery terminals to cause starting problems when the weather starts to turn cold. But take it to any parts store and they'll test your system for you for free while you wait.
^^^ true. work smarter not harder lol. just sit back relax and let some one else work out your problems...
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In 1987, Road & Track published a test summary that shows the 1988 Honda Prelude 2.0Si 4WS outperforming every car of that year on the Slalom, including all Lamborghinis, Ferraris, and Porsches. It went through the slalom at 65.5 mph (105.4 km/h), an amazing result for the time. For reference, the 1988 Corvette took the same course at 64.9 mph (104.4 km/h).
http://en.wikipedia.org/wiki/Honda_Prelude
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Old 11-10-2011, 10:12 AM
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Re: Alternator or Battery?

^^man, ererybody knows that lil tid bit, why don't you post a link to the segment of top gear modding the 89 lude w/ 4ws for their off road challenge lol
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Old 11-10-2011, 10:43 AM
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Re: Alternator or Battery?

Quote:
Originally Posted by itsdatoneguy View Post
^^man, ererybody knows that lil tid bit, why don't you post a link to the segment of top gear modding the 89 lude w/ 4ws for their off road challenge lol
lol so i guess i just didnt know that. ive never seen the top gear episode
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In 1987, Road & Track published a test summary that shows the 1988 Honda Prelude 2.0Si 4WS outperforming every car of that year on the Slalom, including all Lamborghinis, Ferraris, and Porsches. It went through the slalom at 65.5 mph (105.4 km/h), an amazing result for the time. For reference, the 1988 Corvette took the same course at 64.9 mph (104.4 km/h).
http://en.wikipedia.org/wiki/Honda_Prelude
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Old 02-19-2012, 05:38 PM
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Re: Alternator or Battery?

so i know this thread is a lil old, but it addresses my problem pretty well, I just bought my first honda, 92 lude with a h23 swap, and the alternator isnt charging the battery. both items are good (had em checked) and i cant trace the wire back to find any breaks/corrosion. would it be possible to hardwire the alt to the battery to take care of this problem, or does the wire run into the fuse panel/ or brain somewhere? thx yall, i would greatly appreciate any help you can give me.
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Old 02-19-2012, 05:44 PM
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Re: Alternator or Battery?

Not 100% sure but I believe if u hardwire it, you'll fry your battery....there would be nothing to regulate the charging and you would overcharge your battery, maybe even blow it up.
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Old 02-19-2012, 06:34 PM
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Re: Alternator or Battery?

Very easy to do. Just get a nice big wire and attach it from the big alternator stud and hook it to the positive side of the battery. Done this to two of my cars. It will charge the battery from the alternator voltage so it's already regulated to 13 or 14 volts. If the battery still doesn't hold a charge then it's a bad battery or somethings drawing on it while the car is shut off.
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Old 02-19-2012, 10:39 PM
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Re: Alternator or Battery?

thanks for the input guys... so wire it directly to the positive terminal, I understand that the alt puts out between 13 and 14 volts but will it overcharge the battery if i run the car like this for a long period of time? sorry but im no mechanic... tho i do know a lil from wrenchin on my previous rig:91 toyota p/u. im jus a lil hesitant to do this because i know the wire runs through a voltage regulator
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Old 02-19-2012, 10:53 PM
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Re: Alternator or Battery?

ok so before i hardwire the thing in, i tried pullin the negative terminal while it was running, and the car died... so even tho i know the alternator is good, its not providing current to the motor... im lost here guys, any other sugestions?
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Old 02-20-2012, 08:13 AM
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Re: Alternator or Battery?

A battery is charged by altenator current only. That's why when you always get the same voltage while it's running across the battery. While it's running, put your voltmeter across the negative and positive. It will be the same voltage as the alternator. If it wasn't higher than 12 volts then the battery would never charge. A battery always reguires voltage slightly higher than what the battery is rated for to charge. That's why alternaters always put out 13 or 14 volts. If you are not getting 13 0r 14 volts while it's running, then you have a problem somewhere probably in the fuse block area. Then you should hardwire that alternator wire back to the battery. Simple. Also, don't ever remove a cable or alternator wire while running cause the built in voltage regulator in the alternator has nowhere to send the voltage and might damage the alternator.
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Old 02-20-2012, 03:01 PM
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Re: Alternator or Battery?

right on... thanx for the help! I'm back on the road, look out smokies! haha
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Old 02-20-2012, 05:20 PM
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Re: Alternator or Battery?

No problemo!
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Old 02-22-2012, 09:25 PM
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Re: Alternator or Battery?

ok so hypothetically speaking... if i try to hook the alt directly to the positive batt terminal and it arcs... wut then???
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Old 02-22-2012, 09:34 PM
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Re: Alternator or Battery?

sOUNDS LIKE YOUR ALTERNATOR HAS A PROBLEM . tHAT VOLTAGE FROM THE ALTERNATOR SHOULDN'T HAVE A GROUND.IT SENDS VOLTAGE OUT. rUN THE ENGINE AND PUT THE VOLTMETER ON THE FAT TERMINAL AND THE OTHER PROBE OF THE VOLTMETER ON A GROUND. sHOULD GET 13.6 - 14.25 VOLTS. dO THAT FIRST. tHE TWO WIRES THAT GO INTO IT SHOULD BE ONE 12 VOLT CONSTANTLY AND THE OTHER 12 VOLTS WHEN THE KEY IS TURNED ON.
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Old 02-23-2012, 12:19 AM
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Re: Alternator or Battery?

had alt tested at autozone... came back good. and im reading 13.8 to ground... strange thing is, if i connect the alt to the negative terminal there is no arc... WTF IS GOING ON HERE!?!?!?!
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Old 02-23-2012, 08:29 AM
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Re: Alternator or Battery?

sTART THE ENGINE AND PUT THE VOLTMETER ACROSS THE BATTERY TERMINALS. iT SHOULD BE CLOSE TO WHAT THE ALTERNATOR IS PUTTING OUT. If it is, then the battery is getting charged.No need to hard wire it.
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