HI everyone:

Ok, so I'm wrapping up the '02 LS1 into an '84 T/A engine swap, and the other week I was plagued by my starter not working. turns out it was the headlight low beam/ high beam switch causing the starter to not work. (somehow this must disrupt the starter circuit) So I solve this..

Now, my car has an electrical short in the system which blows out the 10 am "gages" fuse every time I turn the key on. It didn't do this before. It worked, the fuel pump came on and it pressurized the fuel system. At some point saturday morning this decided to short out. now it blows out and although I can now use my starter, I still can't start my car!

erghhhh!

The only things I installed this weekend are :

1- the headlight low beam/ high beam switch on the steering column.
2- the four oxygen sensors.

{regarding the 02 sensors, all 4 of mine have the "longer" wire, but this is how they came. I asked in an earlier post regarding is there a difference between the front and back ones, but mine are all the same size. does this matter? would this cause my short?}

After searching for obvious shorts (not finding any) and blowing up 30+ fuses trying to find the problem, I'm still stuck. I did discover that if I unplug the 7-wire plug in the back of the car (I installed the '02 factory plug for the fuel tank/ emmisions behind the back seat.) This disconnects the fuel pump as well as several other emmisions pieces. but lets the fuse live.

I also tried connecting these guys one at a time to see if a certain one of these was the culprit. (a wire plus the ground to complete the circuit) No luck. all 7 need to be plugged in to short the system.

When I install a new fuse, and turn the key to "on" I hear a tiny zap, then I hear the fuse blow out in the gauge panel. so it sounds like a direct positive to ground type of short.

I even tried installing new fuses last night (after dark) to look for a zap/ spark, but no luck.

any suggestions?

I think tonight I'll try disconnecting the headlight switch, then the 02 sensors to eliminate any other variables, but other than that I'm tapped on ideas.

and like I mentioned before, this did work earlier. I used to be able to turn the key on, hear the fuel pump pressurize, etc. now I can't. FYI I soldered all my connections, I used heat shrink tubing, and wired them one at a time to minimize crosswiring/ confusion.

thank you for your time!

-BV