Hitting bumps and truck loses power for half a second

GRIZZLYGHOUL

MEMBER
1989 CHEVROLET 1500
100,000 MILES

When driving this truck, I can hit a bump in the road and I can see the battery gauge drop way below 9 and the check engine light flashes for a second. The truck loses power for that half a second, and the battery gauge will continue to do that with every bump I hit. But the problem first started only when I would drive. It would randomly stumble for half a second and then go back to normal. But it slowly got worse over a weeks time. Then one night I was coming home from work and I hit the same usual bumps going my same speed but this time when I hit a bump it stumbled. That was only about 4 days ago, and it doesn't seem to get better. Help?

Wednesday, February 19th, 2020 AT 11:15 AM

1 Reply

CJ MEDEVAC

MECHANIC
11,004 POSTS

This works at times,

while it's idling,

shake/move wires or harnesses around "normally", try recreating the "G-forces" in a turn or up and down bumps in the road. See if he cut's off or even skips a little. Wiggle the wires to everything.

Violent and way over the top flopping/grabbing/pulling the wiring about may just move the problem out of the way for now, but then it might reappear in the future, just when you don't need it to! It's best to find it now if you can, so be gentle with the shaking and wiggling process. Recreating the factors might just find it.

If you do locate the area, I might be able to help out with some diagrams.

The Medic

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Wednesday, February 19th, 2020 AT 4:28 PM