SOURCE: day time head lights won't turn off
A simple fix is to pull fuse number 15 in the fuse box under the hood.... (by the radiator... long black box about 3 inches wide by 12 inches long.) It should be a 15 amp fuse. This will not really fix the issue, but its a heck of a lot easier than the tracking down you might need to do. What? It could be a headlamp switch, a daytime runninglight module, or a short in the wire for the daytime running lights. This simple easy thing is to pull the fuse and see if that works for you now. (You will lose daytime running lights doing this. So determine if you need those first... legally or otherwise.)
SOURCE: need free service manual for 1997 isuzu npr truck
SERVICE MANUALS NOT FREE.YOU HAVE TO BUY THEM.
SOURCE: a/t oil temp light come on 1999 isuzu npr diesel
Check your trans fluid and inspect for leaks asap. If level is good and leaks are none to minimal, I would suggest a new trans cooler. Your current one could be clogged.
SOURCE: 2000 isuzu npr
if you have already replaced the booster, it is probable that the vacuum pump is the culprit.
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