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GMC Jimmy Electrical System

102 messages,  Last post on Nov 24, 2009 at 6:06 AM

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#1 of 102 How do you know if your alternator is going 99 GMC Jimmy? by mikesmith06 Aug 20, 2006 (4:49 pm)
Hi,   Anyone out there have any tell tale signs of how to know if you alternator is going, I have a gut feeling that mine is going but no way to prove it, anything helps.... ps after I deal with this issue I will be installing my 2nd set of front hub and ball bearing assembly, you think a recall would be done or some kind of class action suit against this makes me sick oh well.... Replies to this message: repairdog (Aug 21, 2006 2:32 am)
#2 of 102 Re: How do you know if your alternator is going 99 GMC Jimmy? [mikesmith06] by repairdog Aug 21, 2006 (2:32 am)
Replying to: mikesmith06 (Aug 20, 2006 4:49 pm) Your battery will start to slowly discharge as the alternator fails - or be dead one morning. Often you will hear it crank slower on start. Test with a volt meter at the battery - 12.6 volts off and then running 13.5-14 volt range from alternator. Also look at the gage and it should show that same 13.5-14 range running. Avg 80k mileage for one. Hubs should last 80-120k also on avg. There are a few cheap brands or economy hubs on the market that fail faster for about $110 each. The TRW and BCA ones are over $150 each.
#3 of 102 Jimmy Instruments Fail by jimmy99white Mar 12, 2007 (5:21 pm)
#4 of 102 Jimmy Instruments Fail by jimmy99white Feb 20, 2007 (6:40 am)
This is an interesting one and I am wondering if anyone out there has any ideas. I have a 1999 Jimmy SLE w/ 96K. I bought it used a few months ago. The issue going on is this. I will be driving and with no build up or indication, all of the instruments (speedometer, tach, oil, temp, gas, etc) on the dash will fail to zero. The vehicle will not shut off and the instruments will return to normal after about 3 seconds. This has happened to me three times while in cruise control but it just happened to my wife while driving in the city here (no cruise).   There are many other things such as the heater fan doesn't work in position four but does work in position 1 - 3. (That just began a few days ago). I am looking for wiring diagrams for this but don't know where to find them.   Anyway, if somebody has an idea about the instrument failures, please let me know. Thanks. Replies to this message: bowanna03 (Mar 12, 2007 5:19 pm)
#5 of 102 Re: Jimmy Instruments Fail [jimmy99white] by bowanna03 Mar 12, 2007 (5:19 pm)
Replying to: jimmy99white (Feb 20, 2007 6:40 am) I had the same problem with a 1998 GMC Jimmy and spent thousands of dollars on troubleshooting electrical. But the problem all along was a bad ignition switch. any other questions let me know my email is jtggwyahoo.com
#7 of 102 Chevrolet Blazer/GMC Jimmy: Brake Light Replacement by jubilee1229 Mar 13, 2007 (5:02 pm)
#8 of 102 Third Brake Light Replacement by jubilee1229 Dec 08, 2006 (7:42 pm)
I am trying to replace the third brake light on my '02 Jimmy. Of course you can't just replace a bulb on these ones, you have to buy a whole new light. I have the new one and I have made sure that it is the correct replacement.    Does anyone have any instructions on how to replace this light? Most importantly, how to get to where the wires "plug in"?    Thank you Replies to this message: cairns (Mar 13, 2007 5:02 pm)
#9 of 102 third brake light, by cairns Mar 13, 2007 (5:02 pm)
Replying to: jubilee1229 (Dec 08, 2006 7:42 pm) On mine I cut and resoldered the wires. The used heat shrink tube to seal. Do a nice small job, that way you do not have to dis-assemble the truck to get that job done.
#10 of 102 93' Jimmy Dash and ABS Trouble by jg85 Mar 26, 2007 (4:55 am)

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