My 1998 GMC Jimmy did something really strange today. I was driving and all
the warning lights on the dash came on. The seat belt, ABS, check gauges,
brake, etc. They did not say on long. Then a mile or two down the road it
did it again and came on and off a couple other times. Then the service
engine light came on. I took it to Auto Zone and they checked the codes and
said it showed electric failure on two things. It did when I was going there
seem to not be shifting right. I thought maybe the alternator was giving a
surge. I had just put a alternator on 3 months ago and the guy at AZ said
take it off and bring it in he will give me a new one under warranty. I did
this and had the battery tested. Started it up and same thing all the lights
come on and off and now the tack, fuel, gauges go to zero.
Any idea what I should look for, or should I look for a Mr. Goodwrench sign.
It is sounding like either a loose or broken wire. Check the main power
lead from the battery to the starter and check your ground. Other than that
good luck cause I refuse to trace wires on my own vehicles.
Sounds like a loose connection somewhere.
You can start at the battery cables. measure from the alternator to battery
then battery to fuse
center, battery to gnd. Check for voltage readings of less than 0.5 volt in the
Next I would suspect the bulkhead connector, especially the high current
connections. Those MetriPac
connectors GM uses loose their spring after extended heating/use. One example of
common failures is
the Blower motor connector.
You may have a bad connection that is causing the ECM to reset.
BTW does the engine skip a beat?
Wife told me she had the Jimmy a couple days ago and when she turned the key
off and went to get out of the car the blower on the AC keep running. I did
some looking around and wiggling of connectors under the hood and it has not
done it again but would like to find what it was and fix it before cold and
my 99 tahoe did that exact thing on the way to the airport, and the engine
momentaily died and then everything back on and it did it again 4 times in
the 18 mi. to the airport.
after hours of checking sockets and connections, i
read where one person had that and the battery connection was corroded. I
thought no, because it always started easy and the lights were strong.
BBBUUTTT, i then removed the cables from the posts(which looked good from
the outside) and found a lot of hard corrosion underneath.
Scraped them all clean, bathed them in baking soda and.
Woww. run perfect from then on and now 15000 miles later and not ever a
Worth checking yours.
My 95 Chevy Z71 did that not to long ago........I shut it down and restarted
and it did it again, then I noticed that the key switch did not return all
the way back after I started it..........I moved the switch back and all the
lights went off and back to normal.....it has done it several other times
where the starter hangs up but since I have sprayed silicone spray in it has
loosened up and has not done it again, guessing it was dusty/dirty
..................just a thought..........Mark
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