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Topic Boards => Chevy - GMC Chassis => Topic started by: ordchief on May 04, 2021, 03:28 AM

Title: starting battery hooked up backwards, where do I start.
Post by: ordchief on May 04, 2021, 03:28 AM
Engine does turn over but no spark to the plugs.  Where do I start chasing wires?
Title: Re: starting battery hooked up backwards, where do I start.
Post by: eXodus on May 04, 2021, 05:25 AM
Fuses first,

https://www.autossquare.com/what-happens-when-you-connect-a-car-battery-backwards/

Look up starting battery backwards on google for cars.  It's the same order of operations.

Whish you luck that you didn't fry a computer.
Title: Re: starting battery hooked up backwards, where do I start.
Post by: tmsnyder on May 04, 2021, 09:32 AM
There's no computer in a 1989, that would still be carbureted. 

Could have messed up the regulator in the alternator.

Might also mess up the ignition module.

Other things,....?

How big was the spark?
Title: Re: starting battery hooked up backwards, where do I start.
Post by: ordchief on May 04, 2021, 11:08 AM
thanks for the reply.  very little spark.  a bit of a crunching noise like wading a newspaper.  The battery isolator monitor was lite up which was unusual and indicated something was wrong.  This was without the key being in the ignition.  That's when I checked the battery and found it backwards. all fuses are good.  engine cranks but only sends around 7v to the distributor.  No noticeable burnt wires.  No spark while cranking or ignition in the run position.