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Dashboard lights headlights and all electrical getting to much power

Tiny
BREWHA797
  • MEMBER
  • 2001 SUBARU LEGACY
  • 4 CYL
  • AWD
  • AUTOMATIC
  • 170,000 MILES
While driving all dashboard lights come on very bright, headlights (Low beams) get brighter. First time blew both my headlight bulbs at the same time. Replaced the headlight relays in main fuse box, pulled all fuses, none are blown, just bought a new battery and new connections yet problem is still happening. It is like all the electronics are getting too much power while driving off and on, the new battery had also died two days after I bought it. Alternator one year old. Maybe a bad ground?
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Thursday, March 23rd, 2017 AT 7:36 PM

8 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check ground that runs off battery to body then check ground that runs off of engine to battery. Finally have alternator checked for charging it may be charging too many volts/amps.
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Friday, March 24th, 2017 AT 6:50 AM
Tiny
BREWHA797
  • MEMBER
  • 5 POSTS
Thanks for your reply, checked and cleaned all grounds got alternator/battery test done all checked out fine, still lighting up all dash lights and headlights still getting bright, seems to happen when I press the gas pedal more often then not like when I'm parked and sometimes after unhooking the negative battery cable over night(so my battery doesn't slowly drain) it wont do it until like 15-30 mins off driving, and if I come to a stop all goes back to normal.I would reallyappreciate any other input, thank you
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Friday, April 7th, 2017 AT 11:02 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
What is the charge rate at idle then say at 2000rpm?
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Saturday, April 8th, 2017 AT 6:48 AM
Tiny
BREWHA797
  • MEMBER
  • 5 POSTS
I went to auto zone to have them test it and the guy said it was charging at a normal rate, I didn't ask the exact charge rate. Just figured if it was normal that it was good to go. I'll go back and all them to look again and get the charge rate, what should it be? My knowledge of car electrics isn't really my strong suit, anything else I should check? Should a guy replace the rest of the fuse relays perhaps? Once again thanks for your reply, gratefully appreciated
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Saturday, April 8th, 2017 AT 8:26 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It shouldn't go over 14.3 at any time if it does it may be a regulator or sulfated battery but I kind of doubt that with battery as it's new
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Saturday, April 8th, 2017 AT 11:55 AM
Tiny
BREWHA797
  • MEMBER
  • 5 POSTS
Is my voltage regulator located in my alternatoron this modelor is it separate? I can't seem to find any info on this
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Monday, April 24th, 2017 AT 6:31 PM
Tiny
BREWHA797
  • MEMBER
  • 5 POSTS
Alternator on this model (2001 Subaru legacy)
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Tuesday, April 25th, 2017 AT 3:11 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It's an internal regulator, part of alternator.
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Tuesday, April 25th, 2017 AT 5:43 AM

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