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The black wire will be connected to the body or engine of the van and the red or positive wire is connected to your starter motor. You can also use a 12 volt battery light to check the negative or positive wires. You take the 12 volt battery light and place the negative black wire clip to an earth on the vehicle, then when you touch the tip of the 12 volt battery light onto a positive wire the light will light up. Then you will know which wires are negative or positive sometimes the key has to be on for some wires to work. Cheers
Your check engine light is telling you there is a problem, and you need to have a scan tool to get the diagnostic codes out of the ECM to find and diagnose the problem. Some places will scan the vehicle for free and then give you the DTC codes to help you with your problem. Then repost with the codes and we can help.
95 toyota may have an early obd2 diagnostics,which started for all cars in 96,which means it can track a cylinder misfire,when ck light flashes it can mean multiple misfire detected causing serious loss of power,you can try going to autozone they do free ck engine light code reading ,tell them you may have obd2 plug according to web,let me know codes if you get lucky.with AZ its hit or miss