Justine,
It can't hurt to add the others. The whole idea is to get everything grounded so a couple more from the negative side of the battery to the frame and to a good grounded bolt on the engine "might" help you with the lights.
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 ...just CREWZIN along! ® . . . PT Cruiser Links Moderator 
2000 PT. Original Owner, 110,000 miles
MY technical suggestions are given in GOOD FAITH without total guarantee, if in doubt go to a Garage.
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