 73 1.7 Idiot Light, What does it mean, and why is it on? |
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| retravis23 |
 Nov 30 2010, 07:22 AM
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#1
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Newbie  Group: Members Posts: 4 Joined: 13-March 10 From: texas Member No.: 11,459 Region Association: Southwest Region  |
73 914 sat for over a year (looking for fuel pump). Replaced pump, cleaned tank and fired it up. runs fine. Battery died over that period; had to jump. Getting an idiot light "G"....what is this? How do I diagnose. Clearly I'm not a mechanic, but I can follow instructions! Thanks.
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| jt914-6 |
Nov 30 2010, 07:32 AM
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#2
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Driving & working on teeners 41 years Group: Members Posts: 1,786 Joined: 3-May 08 From: Bryant, Arkansas Member No.: 9,003 Region Association: South East States |
That "G" light is for the Alternator.....Check the charging system, inlcluding the voltage regulator, with engine running with a volt meter on the battery...should be around 13-14.5.....
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| type47 |
Nov 30 2010, 07:33 AM
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#3
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Viermeister Group: Members Posts: 4,254 Joined: 7-August 03 From: Vienna, VA Member No.: 994 Region Association: MidAtlantic Region |
Generator/Alternator light ... it can light up when alternator output is not as great at battery voltage which could be an alternator problem or voltage regulator problem among other things that people here will state...
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| Hammy |
Nov 30 2010, 12:23 PM
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#4
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mr. Wonderful Group: Members Posts: 1,826 Joined: 20-October 04 From: Columbia, California Member No.: 2,978 Region Association: Northern California |
Try cleaning fuses and fuse box too. Check voltage reg, and where the alternator plugs into the relay board.
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| rgalla9146 |
Nov 30 2010, 12:36 PM
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#5
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Advanced Member Group: Members Posts: 4,555 Joined: 23-November 05 From: Paramus NJ Member No.: 5,176 Region Association: None 
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QUOTE(retravis23 @ Nov 30 2010, 05:22 AM)  73 914 sat for over a year (looking for fuel pump). Replaced pump, cleaned tank and fired it up. runs fine. Battery died over that period; had to jump. Getting an idiot light "G"....what is this? How do I diagnose. Clearly I'm not a mechanic, but I can follow instructions! Thanks. Sat for a year ? First see if the fan belt survived. |
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| r_towle |
Nov 30 2010, 12:42 PM
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#6
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Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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If you did not replace the battery with a known good battery, it could have a bad cell that will short out the charging circuit.
I am not sure if you guys in the warmer climates see this, but up here where an uncharge battery sits over the winter, it will freeze and wreck the battery...one good freeze is all it takes to lunch a battery, in my experience. A cheap way to see is replace the battery with one of your other car batteries and see if the light goes out... If it does, go to Sears... rich |
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| 914 shifter |
Nov 30 2010, 04:52 PM
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#7
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airhead Group: Members Posts: 266 Joined: 28-August 10 From: ny/nj Member No.: 12,111 Region Association: North East States |
check ground at trans strap,battery,injectors,and fuse panel
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| Drums66 |
Dec 4 2010, 01:08 PM
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#8
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914 Rudiments Group: Members Posts: 5,321 Joined: 15-January 03 From: Coronado,Cali Member No.: 151 Region Association: Southwest Region |
....Means you're too late for the show! (IMG:style_emoticons/default/stones.gif) (IMG:style_emoticons/default/rock_band.gif) (IMG:style_emoticons/default/rock_band.gif) (IMG:style_emoticons/default/rock_band.gif)
(follow instructions above) (IMG:style_emoticons/default/bye1.gif) |
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| dangrouche |
 Dec 4 2010, 01:27 PM
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#9
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dangrouche Group: Members Posts: 550 Joined: 1-May 04 From: San Francisco Bay Area Member No.: 2,012 Region Association: None |
Everything as reported above.
put ammeter on the postive and neg terminals and you should be in the 13.6 volts. If it is in the 16 volt range, you need a new regulator (relay board) If you have a load meter (from Harbor freight), then you could check how strong the battery is when the car is not running. Check tension on alternator belt Check fuse. the fourth one from the right Worst case is the alternator is shorted and needs to be replaced (if car ran fine when last run, and car was not exposed to moisture/elements, I would not expect it to be become bad all of sudden) hopefully the simple stuff, a loose belt or low battery charge. it starts become time consuming when the alternator needs a change out. tell us what happens |
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