"No power, anywhere" [Archive] - SR20 Forum

: "No power, anywhere"


sac02
02-01-2010, 01:35 PM
I'm in Ann Arbor MI, trying to help my LeMons teammate in Akron OH diagnose why our car has "no power". Can you guys try to help me/us?

Clif Notes: According to not-that-electrically-inclined teammates: car has "no power, anywhere". What should I/we check?

Read below for more details.

During the last few weeks we have been working on the cage and now want to drive the car to a friend's shop to have it welded up. During the cage work we removed the dash harness (not the engine harness) to clean up the interior to simplify the cage install. We also went through the harness and isolated circuits that we no longer need (A/C, etc) but we did NOT cut them out of the harness, we just zipped tied them all together (we wanted to make sure the car ran again before we started cutting wires).

This weekend my teammates plugged everything back up to try to start the car, and nothing happend. Their truobleshooting involved a test light, and the declaration, "No power, anywhere". With some prompting, I dragged more info out of them: battery was charged and connected, ECU was connected. In their words, they didn't try to "trace" the power back from the battery, they just stuck a test light all over and didn't see any power - no lights, no fuel pump, no cranking - that was all the diagnosis they did, or at least all they gave me.

My first thought was a main fuse - does the b13 have one like other cars I'm familiar with? What else would cause a car to have "no power, anywhere"?

Thanks

cruisnhard
02-02-2010, 05:51 PM
yes there is a main fuse. Sometimes welding close to the front of the car can cause low amperage fuses to blow. Check all the fuses and you may want to tell them to use a multimeter. You can also pull both the cables off the battery and see what kind of resistance is there. It should be infinite, but if you put the multimeter on the diode or sound setting and you hear it beep, then you have a short to ground somewhere in the harness.