Members of Cardiff City Supporters' Trust have voted against plans by the club's owners to change the colour of the club's shirts and badge.
Nine out of ten members said they felt they had not been consulted sufficiently over the changes.
"The club now needs to reflect very carefully on the views of some of its most loyal supporters." said Tim Hartley, the chair of the trust.
"We believe that as a minimum, all season ticket holders should have been consulted in advance.
"The results again highlight the need for elected supporter representation on the board of Cardiff City Football Club", he added.
Trust members voted 54-7% to 43.8% against the changes, with 1.9% abstaining.
The club announces a revised kit and logo, along with 'ambitious' plans for a new training facility, as part of a 'major' investment.
Cardiff City say that talks between Dato Chan Tian Ghee and the club's board have ended.
The owners of Cardiff City meet to discuss the future of the club on Tuesday.