I purchased the trouble shooting book, All you need to know, about your isuzu, trouble shooting, electrical, overhauling, etc. Right;;;;;; didn't say anything about the Leds that were on. example, charge light on, check wiring, or alternater needs to be replace, nothing on the oil lights either and if all fails, dig this, bring it to the professinoals or to a dealer. I went thought the whole electrical systems, all the wire daigrams, couldn't find any shorts, I use my meters ( true Rms meter) short locator, check fuses, relays, and brought out the, it's own computor diognastic test, I read out all the codes and Identified all the componets replaces it, all the lights went off for about 30 seconds and all came back on again. The fuel lights is on and also the fuel guage don't work too. O2 sensor lights on also, I replaced the O2 same, lights went off for est. 10 seconds, and right back on, P. S. do not take out the bulbs in the cluster because that will create more problem, the engine will not work right is the light bulbs is just taken out.