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The Gentleman's Express: Tech-Tips from the JIOC

Table of Contents

Fan Relay Codes

Author: CFF

When replacing the metal Lucas relays with the HD Lucas-supplied Bosch relays, a problem can be caused by a difference in the terminal coding.

When replacing either the 4 or 5 prong relays use the following for reference tothe equivalent terminals:

*Used with any of the split fan wiring systems.

LucasC1C2C3W1W2
Bosch8730/5187A8586
Start relaysolenoidpowerignitiongear inhibit sw.
C/o relay-fuela/c ctl swpowerfuel lid swgroundignition
Horn relaypowerc/o relayignitionhorn push
Horn c/o relayair comphorn relayhornsc/o switchignition
Fan & bk/lightrad fansign sw relaybk/light swthermo swignition
Ign sw relayfan & bk_ltpowergroundignition
Fan relay* fanpowerignitionthermo switch
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