Impending Electrical Doom

DblD

Active member
Jun 4, 2007
43
0
Southwest Missouri
1998 Disco w/ 162,000 miles.

I drove all over town earlier today running errands with no symptoms and no warning signs of impending electrical doom. I got in the truck this evening; it started ok but was idling roughly and soon died. When I went to restart it acted as if the battery was dead. The overhead light was dim and lights on the dash were dim. I was in a hurry to meet with some friends so I got out the jump box and hooked it up. Several attempts to start, truck will turn over and fire but quickly dies. I try one last time with the battery box and it finally starts. I hesitantly head off to my meeting. While driving I am getting some popping coming from the rear sub woofer. This is accompanied by the radio display dimming. I also notice that the RPMs are way up. The truck usually idles around 750RPM. Tonight it was idling at about 1200RPM and was surging up to 1500 to 1700 without my foot on the accelerator. Difficult to keep the thing still at signal lights with it revving like this. After the meeting I get in the truck and turn the key and get nothing but a bunch of clicking noises coming from the passenger glove box area. It does start after the jump box is hooked up and runs fine in the way home. I have lights and all the ancillaries seem to be working fine with exception of the radio cutting out.

So, what say you?

Could this be an easy fix like maybe just replacing my eight-plus year old red top Optima? Are these symptoms of a failing alternator? Possibly a bad ground somewhere? Where?

Maybe just get it started one last time and ?accidentally? drive it into a local pond. I have searched for ?electrical problems? using the search feature. I scanned many of 300-plus posts but couldn?t find much with similar issues.

FOR THE LOVE OF EVERYTYHING HOLY?
Give me an exploded third member, a broken half shaft, a swivel ball to rebuild, hell even some light body work?. Anything, ANYTHING is better than chasing down electrical problems.

Sorry for rambling post (banging the keys is good therapy). Any ideas or suggestions are welcome.

Thanks,
dd
 

adriatic04

Well-known member
Mar 22, 2007
2,506
2
cleveland, oh
i've had those symptoms before on another vehicle, it was a bad alternator. but could also be battery and grounds, I would have the battery tested (autozone, etc.)
 

SGaynor

Well-known member
Dec 6, 2006
7,148
162
52
Bristol, TN
Well, sounds like battery and/or alternator. Start at the basics:

Check the voltage of the battery without the truck running (should be in the 12-14V range). Turn the truck on and check the battery voltage again (should be ~14V). Take the battery to a parts store and have it load tested.

Alternator: check the output voltage on the voltage regulator (I can't remember the spec, but I think it should be ~14V +- 0.5V - search DWeb or look in Rave). If it's below the spec value, bad alt.

And yeah, check the battery wire connections (terminals, etc.). Maybe even take them off and clean them and the connection surfaces with some emory cloth.

Edit: Just saw the "eight year old Optima." I think that's the likely problem....
 
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DblD

Active member
Jun 4, 2007
43
0
Southwest Missouri
Thanks for the comments.

Dropped in a new Optima Red Top and everything seems to be fine (knock wood). I found my receipt for the Optima battery I just replaced in an old file I kept on the truck. I purchased it in June of 1998 for $124.00.

Battery life - just short of ten years?


Yea, I can live with that.

dd