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02-28-2009, 11:49 AM
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#1
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Join Date: Sep 2004
Location: Haledon, NJ
Posts: 5,162
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alternator wires
two wires coming from the plug for the alternator (red and tan/white stripe) go along the valve cover and meet up with the injector wires and go down the back of the block to a "Y" junction of more wires. From here, where do they go? I've checked out a few diagrams but I can't find the wiring for the alternator and battery.
I put a smaller pulley on the alternator thinking that would help my volts issue at idle with accessories on etc but it didn't help at all. I also tried putting an external ground on the alternator and that didn't help either. I'm completely stumped.
For any new readers: (The car has a new ECM, new battery, alternator was checked, all grounds have been cleaned and/or upgraded to thicker wire where possible, including the battery to alternator wire.)
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1989 IROC-Z 355 LT1 T56 Swapped
2016 Chevy Colorado LT 3.6 v6
2008 Jeep Grand Cherokee Laredo 4.7L RIP 12/29/2016
1998 Honda CBR 600F3
2003 Yamaha FX140
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02-28-2009, 03:16 PM
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#2
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,149
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Tan is idiot light
Red should got to "the splice"
See the wiring diagrams in the link.
What is idle voltage? Did you verify that with a volt meter at the alt itself? Are your body/engine grounds all there? Has the alt been load tested in the car (not the bench at the store)?
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02-28-2009, 07:03 PM
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#3
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Join Date: Sep 2004
Location: Haledon, NJ
Posts: 5,162
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I looked at the diagrams in the link and from what I can read I don't see the alternator or battery there. At idle with headlights on, brakes on, and blinker the guage shows around 12 and dipping in conjunction with the flash of the blinker. My interior dome light also dims in conjunction with the blinker even without any accesories on. I verified this at the battery and the alternator was bench tested at autozone but hooked up to a belt and everything. I've also had a brand new alternator tested on the car and nothing was different.
__________________
1989 IROC-Z 355 LT1 T56 Swapped
2016 Chevy Colorado LT 3.6 v6
2008 Jeep Grand Cherokee Laredo 4.7L RIP 12/29/2016
1998 Honda CBR 600F3
2003 Yamaha FX140
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03-01-2009, 02:57 PM
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#4
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12 Second Club
Join Date: Aug 2004
Location: Oradell
Posts: 8,368
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its a third gen... lol, my guage dips for everything, never really thought much of it!
honestly i cant remember where the wires go to, i tore apart a few harness's last year but my memory isnt working right now
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86 Camaro
88 Camaro
95 Impala SS
97 Trans Am WS6
98 Blazer ZR2
00 Corvette
04 CTS-V
07 Sublime Charger Daytona
10 Tahoe SSV
12 Tahoe LT
17 Malibu LT
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03-01-2009, 04:57 PM
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#5
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Join Date: Sep 2004
Location: Haledon, NJ
Posts: 5,162
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my 92 RS was nothing like this that's why it bugs me.
__________________
1989 IROC-Z 355 LT1 T56 Swapped
2016 Chevy Colorado LT 3.6 v6
2008 Jeep Grand Cherokee Laredo 4.7L RIP 12/29/2016
1998 Honda CBR 600F3
2003 Yamaha FX140
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03-02-2009, 01:11 AM
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#6
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12 Second Club
Join Date: Aug 2004
Location: Oradell
Posts: 8,368
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lol my 92 RS wasnt either... or my 91 Z28 for that matter, but those cars had the newer style wiring harness's, the 90-92's...
__________________
86 Camaro
88 Camaro
95 Impala SS
97 Trans Am WS6
98 Blazer ZR2
00 Corvette
04 CTS-V
07 Sublime Charger Daytona
10 Tahoe SSV
12 Tahoe LT
17 Malibu LT
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03-02-2009, 07:12 PM
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#7
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Join Date: Sep 2004
Location: Haledon, NJ
Posts: 5,162
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true, SD upgrade??? hmmmm lol
__________________
1989 IROC-Z 355 LT1 T56 Swapped
2016 Chevy Colorado LT 3.6 v6
2008 Jeep Grand Cherokee Laredo 4.7L RIP 12/29/2016
1998 Honda CBR 600F3
2003 Yamaha FX140
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08-15-2009, 05:24 PM
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#8
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Join Date: Aug 2004
Location: Hawthorne, New Jersey
Posts: 516
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Ted my 89 did it if it makes ya feel better! I think the 93 did untill I relocated my battery and thus rewired the alt and all the connections between to the battery. Hell it may still do it, lol.
Put LEDs in your blinkers!
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