Bad ground? Please help!

80

Asked by Nov 13, 2015 at 03:05 PM about the 1993 Chevrolet C/K 1500 Cheyenne Extended Cab LB RWD

Question type: Maintenance & Repair

I have a 93 Chevy Silverado 1500
4x4 ext cab, short box with the 5.7l
motor n auto tranny. My problem is
this, since I had my motor replaced I
have had weird electrical things
going on. Such as when I turn my
turn signals on, my radio cuts out for
a second, my speedometer and tach
dance when they blink, and my
battery gauge drops. The battery
gauge never reads at 14, maybe at
10. I can't use my headlights, and
radio at the same time, I can't use
my windshield wipers and radio at
the same time. It's almost like there
is not enough power. But my truck
starts and runs just fine tho. Every
time I hit the brake or anything that
uses power i can see all the gauges
react. Even my fuel gauge. Any
ideas??? I can't take the truck back
to where the motor was done as that
shop would only charge me a arm
and leg. They bent me over for the
motor replacement when I supplied
the rebuilt motor to put in it.

6 Answers

259,635

Did you check and make sure all the ground straps were re- installed? Check and clean your battery terminals and cable ends and have the alternator checked too.

3 people found this helpful.
20,535

I'm not sure when Chevy began using ECU's but you may find this usefull if you have one ... ECU's utilize isolated grounds for data so be aware that there are conditions when the ground is controlled rather than +12. ... I know that O2 sensors use a controlled ground in able to sense the heater current as an example. Notice at the bottom they reference the ground distribution schematics

7 people found this helpful.
80

I just looked at my motor and it did not have any grounds. Is there 1 to the engine block to firewall and 1 from the battery to the frame?

7 people found this helpful.
30

Yes, your negative battery cable should be grounded to block and body, and multiple other grounds should tie frame body and engine together, otherwise a host of electrical problems can ensue. Best bet is to get wiring schematics/diagrams to help pinpoint grounding points, a service manual although expensive would be well worth the investment.

3 people found this helpful.
40

I also found that sometimes, the positive cable is too long and will bump against metal causing a short if it happens to bump your exhaust or rub itself down to the wire....I run into this all the time..I go from a start to a no start weird electrical wig out issue....found my positive was rubbing the exhaust and the inner fender well

4 people found this helpful.

I have a 93 GM 3500 Box Truck, it is a van chassis. Fuel pump quit working, now headlights aren't. Battery has 13.1v in it. Cranks over and starts with ether, but no gas. I thought fuel pump was out so I bought a new one but haven't tackled dropping the tank. Watched a youtube video about weak battery causing fuel pump to not work. So I started checking. I put in a new fuel pump relay. It has power to it. I am thinking I have bad ground. Fuel pump went in and out over a days time then just stopped. How do I locate the ground straps for frame and body? Wiring diagram online? Anyone have a link? It has a v6 engine, like a 265 or something.

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