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Re: Where is the fuse for the horn on my 1990 cadillac...
Is the horn not working? If so there is a horn rely that can be bad (to check it find a quite place with the car off, push the horn button down if you hear a click and the fuses are ok but, then you'll need to check the rely it self test light will work good for all the test, then there the wire going up to the horn button both will be under the dash that can be broken.
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Check under the hood, there may be a fuse box (black rectangular) towards the back (closer to the passenger side dashboard) may also be on the side of the dashboard INside the car (drivers side) both will have a diagram of what fuses are where
I've owned my '87 Allante since day 1,, Dew Caddy, Cadillac Nick & currently CARL'S COMPLETE AUTO ( Largo Fla 727.277.3625) are only mechanics to touch my car. Carl is brilliant on any mechanized vehicle,, & has become fascinated w/ diagnosing & repairing Everything on the Allantes.... friendly & wayyyy less $$ + guarantee.
Have you checked BCM input parameter BI61? That is the most common cause of the 2-3 day battery drain. Have you tried pulling fuse #8 under the ash tray for the CPS to see if that stops the drain? You can pull one of the plugs off the AC blower control module to isolate that. If you can not hear the blower motor running with the key off, that probably is not an issue.
Google for Allante Service Tech Bulletins, Battery Parasitic Draw. & what year ur car is. 1987 -88 have probs w/ Fuse # 8 & 25 + circuit breaker 24 - fuses under ashtray. Theyre brilliant cars but now 20-25 years old & many not properly maintained... If ur gonna own an Allante go Ebay & get a Service Manual.