service engine soon light goes on
I have 1989 suburban that the service engine soon light started going on 3 days ago after running it for about 20minuts and it will not go out until I turn off the truck what can be the problem ???
the only thing I notice is my alternator reader it goes down ( just before negative charge mark) after running it for that time .
I think you need to read the trouble codes. Look up how to read OBD1 codes for your truck.
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