 alternator light, G light, that is |
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| Rrrockhound |
 Oct 30 2014, 07:02 PM
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#1
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Member  Group: Members Posts: 192 Joined: 30-November 05 From: Delaware, OH Member No.: 5,213 Region Association: None 
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After my alternator went kaput on a road trip, I had it rebuilt. On the way home, things seemed fine until it got dark and I noticed that the alternator light stays on until the revs reach about 1800 rpm on the tach (although I think my tach reads a little high). I didn't notice that as long as it was light out. The voltmeter in the console reads about 13.5 V though, or about 12.5 with the headlights on. At any rate, I was able to drive home about 4 hours after dark with no issues. Still, does this indicate a bad rebuild? I hope not, because the shop that did the work is about 7 hours away.
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| r_towle |
Oct 30 2014, 07:30 PM
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#2
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Custom Member Group: Members Posts: 24,564 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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Belt tight?
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| SirAndy |
Oct 30 2014, 07:43 PM
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#3
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Resident German Group: Admin Posts: 41,606 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
Mine does that all the time, i have to rev the engine past 2000 rpm after i start it up for the light to go out.
But, my engine isn't exactly stock ... (IMG:style_emoticons/default/smile.gif) |
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| Dave_Darling |
Oct 30 2014, 11:04 PM
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#4
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914 Idiot Group: Members Posts: 14,981 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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Fuses OK? A dirty fuse can cause some similar symptoms...
--DD |
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| GregAmy |
Oct 31 2014, 05:20 AM
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#5
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Advanced Member Group: Members Posts: 2,268 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States
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Don't know if it's the same issue, but see if this helps:
http://www.914world.com/bbs2/index.php?showtopic=237762 |
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| stugray |
Oct 31 2014, 07:20 AM
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#6
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Advanced Member Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
Typical 1 wire alternators (like used on modern cars) are "self excited".
They have to be revved up to a certain point before the field winding is fully energized. The stock 914 alternator is externally excited by the gen light bulb. Is your alternator stock? |
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