Hopefully upgrading to a 2018 Volt this weekend...

edk-austin said:

Dealers do ask about any mods to a car being traded in.

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This is the key. Whatever mods you've done, be they cosmetic or functional, will affect the trade-in value. In the end you may want to try and sell your car to a third party.

colchiro said:

Worst case I may have to keep my modded EVSE and let them keep the one from the new vehicle.

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Don't bet on that. Dealers sell whole cars with all their pieces. I think best bet would be they knock $300 off your trade in order to pick up the stock '13 EVSE part that came with your car so they can sell/auction your vehicle as complete.

Think of the EVSE as an integral part of the car. If you modified the air intake or muffler of an ICE car and tried to trade it in, the dealer will still take it, but it's going to be worth a lot less to them than a stock car, because the next owner may not want those modifications. In your case it may actually be worse because of electrical safety concerns. In that case think if you modded your ICE car with a nitro canister. The dealer might give you a lot less then because the car would go straight to auction.

VoltenRock said:

I didn't even trade it in with the EVSE. A few weeks later, they asked if I would mind giving it to the new owner of my old vehicle, which I did. But it was optional.

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Sounds like the dealer F-ed up.