John McGraw

Can anyone tell me the proper level of fusing for the following circuts. The R and L coil circuts, the R and L injector circuts, The heated O2 sensor circuts( only using the front sensors), and the sensor and PCM power circut. I have gotten advice to fuse the first 4 to 15 amps and the last 2 to 20 amps, but the wire feeding all these circuts is only 20 gauge, so the fusing reccomendation sounds a little high. What were they fused at originally when the General built them?

Thanks, John McGraw

svt

From my 2002 wiring diagram, it shows:

"pcm ign fuse 15A"
"pcm bat fuse 10A"
"inj1 fuse 15A"
"eng ctrl fuse 15A"
"fuel pump fuse 20A"
"eng sen fuse 20A"

I'd use something larger than 20 gauge from the batt to these fuses(18 and 16 gauge for 10/15A and 20A respectively.


-Marc

LS1/T56 -> 1969 Camaro

John McGraw

Thanks SVT,
That jives pretty much with what I have been told. I just can't understand why GM would have fused a circut fed by a 20 gauge wire to 20 amps, or even 15 for that matter. 20 gauge wire is only good for about 10 amps, and in a overload situation, I am sure the wire could be damaged. I am feeding the 6 circut fuse block that feeds these circuts with a 12 gauge wire fused to 30 amps, and I will probably step the fuses down a notch on the individual circuts for safety, since none of these circuts draw more than 5 amps under normal circumstances.

Regards, John McGraw