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On my '87NA the ICV has three contacts...and I use the two outer contacts. I'd guess that in your case you'd just use the two existing contacts - but maybe verify this first.
On my car it does not matter which battery terminal is connected to which ICV contact.
Two lengths of 14 or even 16 gauge single strand "project wire" with alligator clips at each end works great for this. Just clip one end of each wire to each of the ICV contacts, and then clip the other end of one of those wires to a battery terminal...then touch (don't clip) the remaining wire to the free battery contact and if all is well, the ICV will respond very "heathily." In other words, an audible sound more percussive just a light click. If you feel the ICV as this happens, you'll feel that there is definite movement on the inside.
If no response or only the faintest of clicks...the unit likely needs either a good cleaning or replacement.
But again...do verify the procedure for your (two contact) unit!
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