Can a bad alternator affect fuel "economy"? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 01-03-2001, 01:35 AM
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Can a bad alternator affect fuel \"economy\"?

The alternator on my 88 302 just went. Previously, I was getting bad fuel "economy" - about 10.5 mpg. After changing the alternator, the mileage seems to have improved a little, though I haven't taken the time to actually figure it out.

The alternator holds the charge, which in some way has to manifest itself to the sparkplug. If the spark isn't there, then wouldn't it stand to reason you're not getting all the bang you could in the chamber and are just wasting gas?

Enlighten me, please.



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post #2 of (permalink) Old 01-03-2001, 08:12 AM
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Re: Can a bad alternator affect fuel \"economy\"?

Actually, the alternator affects fuel economy through the power draw on your belt drive. The defective alternator could have placed a higher parasitic power loss on the engine because of drag produced by bad bearings, brushes, or windings..

post #3 of (permalink) Old 01-03-2001, 08:22 AM
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Re: Can a bad alternator affect fuel \"economy\"?

yes, the voltage output was prob reduced and affected the spark gen. by the coil. or, the reg went south and generated too much and put a load on the's like a motor in a way. How about a voltmeter in the new type pods that mount of the left pillar?

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post #4 of (permalink) Old 01-03-2001, 10:29 PM
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Re: Can a bad alternator affect fuel \"economy\"?

Great. So I'm not crazy. Thanks for the advice. I'm going to calculate the mileage again but I know the fuel needle physically isn't dropping as fast. Who would've thought...!


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