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Blowing the #12 fuse with ignition on

 
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Old 05-06-2011, 09:48 PM
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Blowing the #12 fuse with ignition on

Hello to all, This is my first post. I have a 1989 prelude 2.0 si. It was given to me after PO broke the timing belt and replaced it, he said it had bent valves. I had the head rebuilt, new timing belt got it all back together when i turn the ignition switch to the on position it blows the #12 fuse( alt/fuel pump). I am trying to test the fuel pump because the car sat for 3 yrs before i acquired it. If anyone has any ideas i would be appreciative.
Mike
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Old 05-07-2011, 10:41 AM
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Re: Blowing the #12 fuse with ignition on

Most likely cause is a short to ground. Check the wires in those circuits for fraying, cracking, any part where bare wire could rub against metal or other wires.

If you don't see anything visually, break out your multimeter and start testing (assuming that is, you have a multimeter).


**Note - Do not poke holes through wire insulation, backprobe at connectors to test wires

** Do not use a test light unless you know what you're doing. Test lights can fry your computer if used on computer controlled circuits.

** Never backprobe using two t-pins next to each other, you could complete the wrong circuit and fry the computer, use one on one side of the connector and one on the other side to test adjacent wires.
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Old 05-07-2011, 07:31 PM
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Re: Blowing the #12 fuse with ignition on

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Originally Posted by havikprelude View Post
** Do not use a test light unless you know what you're doing. Test lights can fry your computer if used on computer controlled circuits.
agreed. test lights are evil. even if u know almost everything i still wouldn't suggest these.
as for the problem i would most definitely say that its the wires and not a component since all your doing is turning it to the on position and the fuse is being blown. sounds like 99% chance of short to ground so carefully follow wires and see if they're being grounded or arcing somewhere
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