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i have a 1986 Chevy Astro cargo van and while driving the van will cut off and my battery will go died but i took it to autozone and the put it on the machine and the test says my alternator is goo as well as the battery
I have owned two Astro Vans 1989 and 1999 and had this problem on both of them.
I was able to trace the source to the Coil.
You may also have a problem with the Distributor Cap and/or Wires.
What happens is that the coil devlopes a short, sometimes because the distributor cap/wires have developed enough resistance that the spark jumps from the coil pack to the valve covers.
Not exactly sure why it drains the battery.
The only way I found it was to run the engine with out the engine cover on and watch for the spark jumping from the coil pack to the valve cover.
If you change the distributor cap and rotor don't get ones with Brass Contacts, they will corode and create the resistance issue. I have had the best luck with OEM cap and rotor.
What else can I help you with?
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