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12-14-2018, 12:30 AM | #1 |
Scooby Newbie
Member#: 474890
Join Date: Sep 2017
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Idiot tries arc welding with an 04 wrx alternator
I was putting an oil pressure sensor under the alternator of my sons 04 Wrx it's a mt car. Going good right up until the time I brush the red rubber on top of the alternator up against the intake and tried my best arc welder impersonation. Don't try it take it from me nothing good can come from it.Now no interior lights no crank no gauges no starter I do however have the chime for key in the ignition with the door open.I have checked the 80 amp fuse in engine bay and it is getting 12.8 volts across it any help is much appreciated. Electrical is NOT my thing but I do have DMM so can ya help a brother out?
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Last edited by 10ecman; 12-14-2018 at 12:37 AM. |
12-14-2018, 04:50 AM | #2 |
Trust no one
Moderator Member#: 11170
Join Date: Oct 2001
Chapter/Region:
Tri-State
Location: NYC
Vehicle:02 RAV4 MT 15 WRX/11 CRZ |
Are you getting voltage measured across the main fuse or measured at both fuse terminals to ground? If it's across the fuse (+ terminal of voltmeter on one side of the fuse and - terminal on the other) the fuse is blown. If it's on both sides of the fuse to ground the fuse is good.
A blown main fuse is the usual result of doing something like this. |
12-14-2018, 06:43 AM | #3 |
Scooby Newbie
Member#: 474890
Join Date: Sep 2017
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Thanks I used both sides but in my panicked state I did exactly that.
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12-14-2018, 08:57 AM | #4 |
Scooby Newbie
Member#: 474890
Join Date: Sep 2017
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That also explains why I got a -12.8 volts last night.
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12-14-2018, 09:39 AM | #5 |
NASIOC Supporter
Member#: 30669
Join Date: Dec 2002
Chapter/Region:
Tri-State
Location: USA, North NJ, 07456
Vehicle:1998 Legacy 2.5GT Silver Sleeper BK, 5MT |
Mulder is correct, if you put each meter probe on each side of a fuse and get a reading, the fuse is blown and the meter is making the circuit.
I clip one lead to a good ground or battery negative, then measure volts on each side of every fuse. Volts on both sides, fuse OK Volts on one side, fuse bad Volts on neither side, maybe another fuse bad, or need the circuit on/key on. |
12-14-2018, 09:56 AM | #6 |
Scooby Specialist
Member#: 476573
Join Date: Oct 2017
Chapter/Region:
MAIC
Location: Lovettsville, Virginia
Vehicle:2008 Impreza WRX STi Silver |
This is why every set of instruction ever made for working on cars starts with "Disconnect negative battery terminal"
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12-14-2018, 10:53 AM | #7 |
Scooby Specialist
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Join Date: Mar 2009
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MWSOC
Location: Indianapolis area
Vehicle:2019 WRX Limited World Rally Blue |
Which is what I assumed he'd done and thus why I was confused about the arc welding comment "that couldn't happen unless he hadn't disconnected the negative battery terminal."
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12-14-2018, 01:03 PM | #8 |
Scooby Newbie
Member#: 474890
Join Date: Sep 2017
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He was and is correct and I should have disconnected the battery yada yada yada but Turpid Porpoise your reply is superfluous and unnecessary. I’m sure you have NEVER skated on anything and all you do is roses and light but it’s fixed so yippee for me. Thanks to Mulder for not blowin me up unlike others. Thanks again Mulder.
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12-14-2018, 02:16 PM | #9 | |
Scooby Specialist
Member#: 476573
Join Date: Oct 2017
Chapter/Region:
MAIC
Location: Lovettsville, Virginia
Vehicle:2008 Impreza WRX STi Silver |
Quote:
Never said I was perfect, just stating a fact. You don't want people to chime in with "superfluous and unnecessary" comments, don't post your screw ups on an open forum... |
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12-14-2018, 02:20 PM | #10 |
Trust no one
Moderator Member#: 11170
Join Date: Oct 2001
Chapter/Region:
Tri-State
Location: NYC
Vehicle:02 RAV4 MT 15 WRX/11 CRZ |
Ok, question asked and answered, I think we're done here.
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