Bogging, hesitation, and missing. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bluec10 · 04-25-2010, 11:35 PM

Need some help with troubleshooting.

250 L6 w. Manual

1. Generator warning light isn't working.
2. Motor runs rough. I have to nurse the pedal to get it to accelerate.
3. Last fall the battery was going dead.

All of this stuff points to an alternator that isn't working, at least in my mind. The one thing that is confusing me is the alternator warning light that isn't working. Is this just a bulb in the instrument panel, or does it mean something else is broken?

Indyuke · 04-25-2010, 11:50 PM

Put a mulit-meter on the alternator with the truck running. If it reads greater than 12 volts, then the alternator is fine. If the alt is bad, then like you said, I'd imagine the generator bulb in the guage cluster is burnt out if no fuses are blown.

It also sounds like something's going on with your carburetor. Your rough running and bogging are solid symptoms of a worn out or badly adjusted carb.

Just my two cents, if it'll help.

04-25-2010, 11:35 PM	#1
bluec10 Registered User Join Date: Apr 2002 Location: Manitoba, Canada Posts: 663	Bogging, hesitation, and missing. Need some help with troubleshooting. 250 L6 w. Manual 1. Generator warning light isn't working. 2. Motor runs rough. I have to nurse the pedal to get it to accelerate. 3. Last fall the battery was going dead. All of this stuff points to an alternator that isn't working, at least in my mind. The one thing that is confusing me is the alternator warning light that isn't working. Is this just a bulb in the instrument panel, or does it mean something else is broken? __________________ Present: 2015 Tacoma. Yeah, not a GM, but I love it. 1969 GMC 32,000 - fix, drive, relax, fix... 2019 BMW R1250 GSA - Yahoooooooo 1979 Honda GL 1000 - retro touring at its best. Past: '05 Sierra 4x4 - Had 270,000 KM and running well when it was written-off by a stop sign runner. '94 F-150 from the "F word" company. I'll admit it...good truck. Sold what was left of it for $800 to a guy who came to pick it up at 11:00 PM with cash in hand. Hmm. '79 Sierra Grande (Black) organ donor - perfect rebuildable 4-bolt 350 and a good TH350. '76 Sierra Grande (Orange) - hate isn't too strong a word. Kid who bought it turned it into a hot rod. '68 C-10 R.I.P. - Dad's old truck...too far gone to resurrect. '59 C-50 - with hoist. Truck is gone, wife isn't. Nuff said.

04-25-2010, 11:50 PM	#2
Indyuke Registered User Join Date: Feb 2008 Location: Lake Stevens, WA Posts: 623	Re: Bogging, hesitation, and missing. Put a mulit-meter on the alternator with the truck running. If it reads greater than 12 volts, then the alternator is fine. If the alt is bad, then like you said, I'd imagine the generator bulb in the guage cluster is burnt out if no fuses are blown. It also sounds like something's going on with your carburetor. Your rough running and bogging are solid symptoms of a worn out or badly adjusted carb. Just my two cents, if it'll help.



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