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05-24-2018, 10:17 AM | #1 |
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Join Date: Feb 2004
Location: Williamsburg, Ohio
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Need more amps
1967 K10 402 bbc
I know this has been discussed but if possible please refer me to the correct existing thread. I am currently running a 55 amp alternator with stock external regulator. It has stock connectors on the alternator. I added 2 audio amplifiers that can consume 50-60 amps. If amps are on and I turn on the a/c blower to half my volt meter drops below 12v charge even off idle. This does not include headlights, brake lights, horn, and running lights. If one or the other is off it shows 13v or so on the voltmeter. I think I need more amps ------ what alternator should I go to that will least effect my oem wiring/external voltage regulator lugs and clocking issues. I run dual batteries. Have a nice Memoral Day weekend. thanks
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1942 Chevy 1/2 ton Rod, 1959 GMC 1/2 ton Fleet Stepside, 1967 Chevy SWB K10, 1985 Corvette Coupe 4+3, 2015 Chevy Duramax reg cab 4WD W/T Last edited by dennislbrooks; 05-24-2018 at 03:42 PM. |
05-24-2018, 05:45 PM | #2 |
meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
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Re: Need more amps
Not sure if your serpentine or not, but Summit seems to have a whole section, including minimum amp rating. Maybe you can narrow something from here?
https://www.summitracing.com/search/...8%2B4294951399
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05-24-2018, 06:54 PM | #3 |
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Re: Need more amps
My 67 is a custom with gauge option. So I will look again but I do not have a dummy light. I removed the amp meter and replaced the slot with a voltmeter. I did see a 1 or 3 wire 10si 100 amp internal regulated for about $95. I would need the correct 2 wire plug and figure out the connection diffs to the external regulator. I am vbelt. Also change the 12 gauge Bat wire and maybe other.
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1942 Chevy 1/2 ton Rod, 1959 GMC 1/2 ton Fleet Stepside, 1967 Chevy SWB K10, 1985 Corvette Coupe 4+3, 2015 Chevy Duramax reg cab 4WD W/T |
05-24-2018, 09:52 PM | #4 |
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Re: Need more amps
Hmm, even if the alt can't provide the current@voltage needed, the battery can. That means your wiring is weak--probably w/ the additional load, or what/where you're measuring is not indicative of what's happening.
I'd be looking for hot spots, making more measurements, etc. before starting to swap parts. |
05-24-2018, 10:07 PM | #5 |
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Re: Need more amps
I think the oldest of my dual batteries is going bad. I have noticed that if a trickle charger starts to do strange things like the yellow and green light is on at the same time or a very fast charge--- probably a battery problem. I will charge, check voltage, and then put a load tester on it. When ignition is on, both batteries are tied together, when off, a solenoid disconnects them.
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1942 Chevy 1/2 ton Rod, 1959 GMC 1/2 ton Fleet Stepside, 1967 Chevy SWB K10, 1985 Corvette Coupe 4+3, 2015 Chevy Duramax reg cab 4WD W/T |
05-25-2018, 12:16 PM | #6 |
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Re: Need more amps
IMO, if your steady draw is more then the alt can provide, you need a bigger alt. Possible worst case scenario, you are running the stereo, lights because it is night, AC, blower on defrost to clear humidity fog, and wipers to clear the rain. Could well have a draw from the batts of 30+ amps even with max alt output. Not something you want for more then a few minutes.
For ease of installation, an about 94 amp 12SI should be a physical drop in installation. Search some of the external reg to internal reg threads on electrical connection changes needed. For most uses, get the 3 wire version with the remote voltage sense wire. That way, any voltage drops in the primary charge wire from the alt to junction block are compensated for. Might want to get one of the junction blocks from a 90's era truck to give multiple connection points. |
05-25-2018, 10:36 PM | #7 |
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Re: Need more amps
One wire alts are for tractors.
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05-27-2018, 11:46 AM | #8 |
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Re: Need more amps
I was in your shoes a few weeks ago, but with help here, I just did an upgrade to the SI alternator (94 amp). Check out my thread in electrical.
It works much better than the 55 amp setup, solved the problem for me. |
05-27-2018, 05:22 PM | #9 |
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Re: Need more amps
thanks guys, I will be pursuing this week
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1942 Chevy 1/2 ton Rod, 1959 GMC 1/2 ton Fleet Stepside, 1967 Chevy SWB K10, 1985 Corvette Coupe 4+3, 2015 Chevy Duramax reg cab 4WD W/T |
05-29-2018, 09:08 AM | #10 |
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Re: Need more amps
ok, the battery in question, charged measures 12.92 volts and easily passes the load tester. I will have the existing alternator tested and refer to dave12's thread info and Dead Parrot for a further plan. I will not go to a 1 wire.
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1942 Chevy 1/2 ton Rod, 1959 GMC 1/2 ton Fleet Stepside, 1967 Chevy SWB K10, 1985 Corvette Coupe 4+3, 2015 Chevy Duramax reg cab 4WD W/T Last edited by dennislbrooks; 05-29-2018 at 09:10 AM. Reason: words |
06-03-2018, 12:36 PM | #11 |
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Re: Need more amps
Was a loose alternator belt. duh... I still may put a higher output alt on it later.
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1942 Chevy 1/2 ton Rod, 1959 GMC 1/2 ton Fleet Stepside, 1967 Chevy SWB K10, 1985 Corvette Coupe 4+3, 2015 Chevy Duramax reg cab 4WD W/T |
06-10-2018, 06:38 PM | #12 | |
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Re: Need more amps
Quote:
You will find you need additional amps as most alternators at rated at maximum output. Everything I have read informs me to add an additional 25 percent to keep from burning up alternators from overuse. |
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