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Re: Do I have this amp thing right?
[Re: rapid67rt]
#423254
07/29/09 07:40 PM
07/29/09 07:40 PM
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Joined: Sep 2005
Posts: 6,516 Santa Cruz, California
Lefty
master
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master
Joined: Sep 2005
Posts: 6,516
Santa Cruz, California
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Quote:
holly blk fuel pump: 4amps meziere water pump: 7amps MSD 6AL: 1 amp per 1000rpm electric cooling fan:9.8 amps
what about headlights?
P = I x E
P is power in watts I is current in amps E is DC volts.
Figure 50 watts per 60s vintage headlight...
50 = I x 12
I = 50/12
I = 4.2 (figure 5 amps per headlight to be safe)
P.S. That fan current sounds low to me too
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Re: Do I have this amp thing right?
[Re: Lefty]
#423255
07/29/09 07:55 PM
07/29/09 07:55 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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ALL of those sound low to me. Are the pumps actually pumping, or just moving air? Did you measure this with the engine running (system voltage up at 14+? Are you the one that posted the other night about this?
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Re: Do I have this amp thing right?
[Re: rapid67rt]
#423257
07/29/09 09:18 PM
07/29/09 09:18 PM
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Joined: Jun 2008
Posts: 1,822 Colorado
denfireguy
top fuel
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top fuel
Joined: Jun 2008
Posts: 1,822
Colorado
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Quote:
I got the amp numbers from item's description in the summit/Mancini catalog? I thought they were low also. I didnt post yesterday but it made me think about my amp numbers. I'm running all these on a 60 amp alt. Am I good?
You are okay even if all of the stuff really take double what the specs read. However, there is still a lot of other stuff to drawing current including tail lights, cigarette lighter, radio, heater, etc. Put in your thump thump amplifier and you are pushing it. It is pretty easy to find higher output alternators in the original style that just bolt in. I would look for one of those. It would just give you a bit more of a cushion. And I was just kidding about the thump thump amplifier. Craig
2014 Ram 1500 Laramie, 73 Cuda Previous mopars: 62 Valiant, 65 Fury III, 68 Fury III, 72 Satellite, 74 Satellite, 89 Acclaim, 98 Caravan, 2003 Durango Only previous Non-Mopar: Schwinn Tornado
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Re: Do I have this amp thing right?
[Re: denfireguy]
#423259
07/29/09 09:43 PM
07/29/09 09:43 PM
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Joined: Aug 2006
Posts: 1,609 Southern Cal
Noblewk
top fuel
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top fuel
Joined: Aug 2006
Posts: 1,609
Southern Cal
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Before you "just bolt in" a new alternator there is a few things to consider.
1. Your wiring set up right now is for 60 amps.
2. Chances are the wiring has a lot more "load" resistance now then when it was new due to corroded connections, oxidated wire, splices, etc. This additional "load" will drop voltage drawing more current "amps" the the device your trying to operate.
3. Current "amps" across a resistance "load" produces "heat"
4. When installing higher "Amp" alternators ALWAYS up grade the wires to your charging system ans your Fuse box.
5. When installing high amp accessories in an older vehicle (5 amps or more) always use a fuse or circuit braker.
Don't be on the side of the road up in flames.....
66 Dart GT, 402 11.18:109 Best
63 1/2 Galaxie 500XL 406 4Speed 13.20:103 Best
2000 Ram
2005 Durango Hemi.
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Re: Do I have this amp thing right?
[Re: Noblewk]
#423260
07/30/09 12:48 PM
07/30/09 12:48 PM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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Only real way to know where your at is to take an amp reading while the car is running. Make sure the battery is fully charged as you want to leave it out of the scenerio. At idle, start turning stuff on one at a time. Record the amp draw of each item. Your alternator should be able to easily keep up with necessary items like fuel pump, fan, headlights. You can easily sink ( go to dischaerge ) a 60 amp alternator ( and even a 100 amper ) at idle if you turn it all on. If you can't stay on the charge side at idle with the necessaties you will have problems. You can try going to a smaller alternator pulley or find someone like "MCI" out of west Chicago ( the Company that builds alternators for "Power Master") and see if they can "soup-up" your 60 amper to put out a little more juice at a lower rpm. I had this done with a 60 amp alternator. Don't have the curve in front of me, but I think I ended up with about 10 more amps at idle than the stock 60 amp alternator provided ( without having to change pulleys ). Worked for me.
Fastest 300
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