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Phil, was Ford still using the instrument voltage regulator in '88? As I recall, the fuel and temp guages were the only ones conected to it. It is simple enough to check: Locate the temp sending unit, should be on or near the thermostat housing ( there will be 2 sending units, one for the guage and the other for the engine management computer. To check, disconnect the wire to either of them, turn the key to run(don't start), using a 12 volt test light ( available at any auto parts place) hook the clip on the test light lead to a good ground and stick the test light probe into the disconnected wire terminal, if you've got the right sender wire, the test light will blink on and off. If not, try the other sender lead, if you get no reaction from either one, then go to the chassis fuse panel and look for a small amp 5/7 fuse marked inst, and check it. If you need to replace the voltage reg, it is only necessary to pull the instrument panel cluster, not the dash. Purchase a replacement reg before you pull the cluster so you'll know what you're looking for and how it plugs into the backside of the cluster. Come back with what you find. |
RV and bus conversion info since 1996.
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