Battery light

96laseredcobra · Oct 15, 2016

So the battery light has been on since I got the cobra . The guy said voltage regulator, but had that, alternator, and battery tested all are good . Any ideas fellas?

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ttocs · Oct 15, 2016

to test the battery you need to take it out of the car, charge it and then let it sit for a few hours before testing it. I have seen batteries come off the charger that tested good but then 3 hrs later with nothing hooked up they start dropping voltage. Also start simple and remove all the battery/ground connections, clean the area(sandpaper works great) then and then retighten. Make sure they are tight enough that you can't wiggle them at all.

lwarrior1016 · Oct 15, 2016

Intermittent no charge from the alternator is really common with these. My f250, 5.4L did the same thing. I took the alternator off and had it tested. It showed good. Then tore it down and found one of the brushes wore a groove in the rotor and caused intermittent issues.

96laseredcobra · Oct 15, 2016

lwarrior1016 said:
Intermittent no charge from the alternator is really common with these. My f250, 5.4L did the same thing. I took the alternator off and had it tested. It showed good. Then tore it down and found one of the brushes wore a groove in the rotor and caused intermittent issues.

I'm pretty sure it's the stock alternator so that might be an issue.

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96laseredcobra · Oct 15, 2016

ttocs said:
to test the battery you need to take it out of the car, charge it and then let it sit for a few hours before testing it. I have seen batteries come off the charger that tested good but then 3 hrs later with nothing hooked up they start dropping voltage. Also start simple and remove all the battery/ground connections, clean the area(sandpaper works great) then and then retighten. Make sure they are tight enough that you can't wiggle them at all.

I'll try it out today

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96laseredcobra · Oct 15, 2016

Oh yeah the guy put led lights in the cluster and said the light came on afterwards?

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96laseredcobra · Feb 15, 2017

Can the alternator failing cause misfires ? All ignition is new.

sent from somewhere,while in my cobra.

ttocs · Feb 15, 2017

if it isn't supplying enough voltage then yes but otherwise its not really attached to the ignition system short of supplying it power.

I missed the comment previously about leds but I have no idea what that is about anyways...