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06-10-2009, 01:26 AM
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CC Member
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Join Date: Oct 2008
Location: rancho murieta,
CA
Cobra Make, Engine: Superformance Roush 327 R
Posts: 76
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Not Ranked
tech question
when the engine is running the tach, fuel gauge, blinkers dont work...when i am not running the engine everything works except for the tach obviously...alternator or battery is bad...also when there is a full battery attached to the on board battery everything works...help please
__________________
 the more you know the more you know you dont know
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06-10-2009, 05:37 AM
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CC Member
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Join Date: Jun 2007
Cobra Make, Engine:
Posts: 52
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Not Ranked
voltage
A low voltage problem most likely.
First thing to check is engine to frame ground.
Battery connections
Wiring to alternator next
Then check voltage while running. Should be 13.6 volts at the battery minimum
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06-10-2009, 08:01 AM
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CC Member
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Join Date: Nov 2006
Location: El Dorado Hills,
CA
Cobra Make, Engine: LA Exotics
Posts: 987
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Not Ranked
You could hire a Porsche to follow you and help with a jumpstart as needed! 
__________________
"Live Life Abundantly"
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06-10-2009, 08:36 AM
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Senior Club Cobra Member
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Join Date: Dec 2001
Location: Shasta Lake,
CA
Cobra Make, Engine:
Posts: 26,594
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Not Ranked
What 747 said plus you might have the battery load tested. A bad cell can cause the alternator to not be able to charge it and keep the voltage up, but normally it would also be low when the car is stopped.
Ron
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06-10-2009, 09:57 AM
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CC Member
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Join Date: Oct 2008
Location: rancho murieta,
CA
Cobra Make, Engine: Superformance Roush 327 R
Posts: 76
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Not Ranked
Quote:
Originally Posted by jrjmac1
You could hire a Porsche to follow you and help with a jumpstart as needed! |
were you at crush 29 last night?
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the more you know the more you know you dont know
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06-10-2009, 10:49 AM
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CC Member
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Join Date: Mar 2008
Location: Ocean Isle Beach,
NC
Cobra Make, Engine: Superformance #2769 Roush 427R Dart Block
Posts: 606
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Not Ranked
Don't listen to Jrmac1 (John).... Just ask him how a GTO runs on 7 cyl. That'll shut him up!!! See me for details!!!
A lot of modern electronics require more than 10 volts just to function. Anything less and they act ADHD.
Step 1...Swap the battery out of you wife's car and put it in the Cobra.
Step 2...If that cures the problem, go to Step 3.
Step 3...When she tells you the "Family Truckster" won't start you say "It needs a new battery".
Step 4...Buy a cool new Gel Battery and swap it back into the Cobra during the early hours of the morning while she's asleep.
Step 5...If that fails, refer to 727's instructions!
PS.... This works for an array of other situations. Tom
__________________
Tom
I miss my Tazer 
Last edited by wanab5150; 06-10-2009 at 10:52 AM..
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06-10-2009, 11:31 AM
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CC Member
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Join Date: Aug 2007
Location: Carlsbad,
Ca
Cobra Make, Engine: SPF 2932 with 438 Lykins Motorsports engine. Previous owner of FFR 5452.
Posts: 2,616
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Not Ranked
With the engine running at idle, turn on the headlights.
Are they on? Does the engine die? Are they bright or dull? Now rev the engine. Do they get brighter when revved? Battery or ground.
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Jim
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06-10-2009, 11:43 PM
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CC Member
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Join Date: Nov 2006
Location: El Dorado Hills,
CA
Cobra Make, Engine: LA Exotics
Posts: 987
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Not Ranked
Don't listen to Tom either...just ask him how a Chevy Tahoe runs with mud up to the floorboards!!!
__________________
"Live Life Abundantly"
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06-11-2009, 11:38 AM
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CC Member
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Join Date: Mar 2008
Location: Ocean Isle Beach,
NC
Cobra Make, Engine: Superformance #2769 Roush 427R Dart Block
Posts: 606
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Not Ranked
It ran on all 8 though!
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Tom
I miss my Tazer
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06-11-2009, 12:53 PM
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CC Member
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Join Date: Oct 2008
Location: rancho murieta,
CA
Cobra Make, Engine: Superformance Roush 327 R
Posts: 76
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Not Ranked
you guys are hilarious...mostly not helpful but hilarious...changed the alternator and voltage regulator and voi la...thats french for the damn thing is fixed...
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the more you know the more you know you dont know
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06-11-2009, 06:30 PM
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CC Member
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Join Date: Nov 2006
Location: El Dorado Hills,
CA
Cobra Make, Engine: LA Exotics
Posts: 987
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Not Ranked
Hey culdad, yes I was there next to the Chevelle. Glad you solved the electrical issues.
Hey Tom, the only 8 you were running on was the 8 in the truck that pulled you out!
__________________
"Live Life Abundantly"
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06-11-2009, 11:13 PM
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CC Member
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Join Date: Mar 2008
Location: Ocean Isle Beach,
NC
Cobra Make, Engine: Superformance #2769 Roush 427R Dart Block
Posts: 606
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Not Ranked
Bite Me. Remember....the 8th plug wire is not just a spare!!!
__________________
Tom
I miss my Tazer
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06-11-2009, 11:27 PM
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CC Member
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Join Date: Nov 2006
Location: El Dorado Hills,
CA
Cobra Make, Engine: LA Exotics
Posts: 987
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Not Ranked
Tom...it's past your bedtime.
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"Live Life Abundantly"
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06-12-2009, 10:27 AM
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CC Member
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Join Date: Mar 2008
Location: Ocean Isle Beach,
NC
Cobra Make, Engine: Superformance #2769 Roush 427R Dart Block
Posts: 606
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Not Ranked
Fine.......
__________________
Tom
I miss my Tazer
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06-12-2009, 02:03 PM
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Regularly Offensive
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Join Date: Feb 2006
Location: yuba city,
ca
Cobra Make, Engine: spf
Posts: 1,231
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Not Ranked
Did you check your tire pressure?......................... 
__________________
Ed
Too close for missles, switching to guns.........
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