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As of 1990, the convenience relays are powered by the convenience control unit which has constant battery power, hence why you can operate the power seats without having the key on. The 87 doesn't have a convenience control module.
The glow plug relay gets its power before the OVP. Both get fed power by fuse 7 in the fuse box. If that fuse was blowing, then yes, it could be the glow plug relay. The only way the 10amp fuse in the OVP could keep getting blown instantly would have to be a direct short to ground from either of the previously listed components or a chafed wire to any of the components.
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