Is 85 amps enough? - Defender Source
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  #1  
Old February 10th, 2009, 09:12 PM
johnpiero
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John Brancato
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Is 85 amps enough?

Hey all.
My electrical components seem starved for juice. For example: my headlights are dim to begin with and when I turn my heater-fan to "Hi" the headlights dim even more-so.
I noticed the alternator reads "Magneti Marelli Type A127i-85" which makes me believe it supposed to put out 85 amps.
It seems to be original so i guess it's supposed to be desinged so.
What else could it be?

BTW, i bought the car like this so i don't know the history. It's a '94 D-90

Thanks.
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  #2  
Old February 11th, 2009, 07:36 AM
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Tom Rowe
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85 amps is plenty for normal operation.
Unless your alt and/or battery are weak/dead, it sounds like a wiring fault. Check, or have them checked. You can do one check yourself. Put a meter on your battery with the engine running to see if you're getting the right terminal voltage.
Then, given you're in NY, I'd start looking for corrosion around your ground points.
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  #3  
Old February 11th, 2009, 08:03 AM
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J. Michael McCaig
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Yeah use a voltmeter and check all your battery and ground connections. Your alternator should be putting out about 14 volts. If it drops with the lights and heater on then I would suspect the alternator. Some auto parts stores (Advance Auto Parts) will check your alternator and load test your battery for free. That might be your best bet.
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  #4  
Old February 11th, 2009, 09:40 AM
rmuller
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Ryan
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The battery is less than 6 months old... I had a yellowtop optima in there, but I needed that to match the dual battery setup on my disco, so I replaced that with a high CCA Kirkland brand... there was no difference before/after in anything with the battery swap.
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  #5  
Old February 11th, 2009, 11:43 AM
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Check grounds and put a relay on the headlights.
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  #6  
Old February 12th, 2009, 07:53 PM
johnpiero
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John Brancato
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Why a relay? What does it do?
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  #7  
Old February 12th, 2009, 09:31 PM
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Andrew Najarian
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Quote:
Originally Posted by johnpiero
Why a relay? What does it do?
That way the lights run directly off the battery rather than through the dash switch. It lowers resistance and will reduce the strain on your light switch.
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  #8  
Old February 13th, 2009, 06:38 AM
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Tom Rowe
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Only thing is, the lack of a relay isn't his problem.
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Tom Rowe
Atlanta, GA

Four wheel drive allows you to get stuck
in places even more inaccessible.

62 88 Regular
67 109 6cyl NADA x2
74 Lightweight - The Antichrist
95 DI 5-speed
95 D90 5-speed
97 D1 Automatic
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