1986 Toyota Pickup con'FUSE'd

Tiny
ERIC R
  • MEMBER
  • 1986 TOYOTA PICKUP
Electrical problem
1986 Toyota Pickup 4 cyl Four Wheel Drive Manual

While out driving, my son blew a 20 apm "Turn Signal" fuse in the cab fuse box, and mistakenly replaced it with a 30 amp fuse. Driving home, he noticed a "hot eletrical smell" in the cab. The turn signals, radio and instrument panel all went dead.
After arriving home he replaced the 30 amp unblown fuse with the proper 20 amp fuse. The instrument panel starts working. No radio or turn signal, but driveable.
Two day later, driving on Frwy. In rain, engine dies. Four jump starts later, truck arrives home (about 6 miles). Charged battery, held charge over night, starts twice following day no problem.
Testing: turn signal lever does not activate lamps (all lamps checked good by hazard switch activation) instrument panel fails again on turn switch activation.
radio still n/g fuses aok. Removed Turn/S assembly, no burn smell or melted wires noted. Removed instrument panel, no burns noticed, lamps all good. Tested two "breakers" on interior fuse box, tested good, flasher unit presumed good as hazard lights flash. Checked engine compartment fuses, all good.
Replaced alternator and battery 6 months ago.
What should I do next?
Saturday, January 16th, 2010 AT 11:48 PM

3 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi Eric,

Thank you for the donation.

Did you check the 10 A Eng fuse located in the underdash fuse box?

It supplies power to the alternator, turn signals, power window, instrument cluster, back up light switch.

Radio gets its power supply from the Cigar lighter and Hazard/ Horn fuse. Check those as well.
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Sunday, January 17th, 2010 AT 1:46 AM
Tiny
ERIC R
  • MEMBER
  • 3 POSTS
Let me be a bit clearer than my first post. ALL fuses, breakers ans flashers in both the engine compartment and the passenger compartment fuse boxes are AOK!
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Monday, January 18th, 2010 AT 10:04 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
I would like to know if battery voltage are available at the following points.

With ignition switch turned on, use a test lamp to test for power supply at both ends of the fuses I mentioned above.

The hazard and flasher uses separate fuses. Test the Green/Blue wire at the multifunction switch for battery voltage.

Engage the reverse gear and check if the back-up lights are working.
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Monday, January 18th, 2010 AT 2:11 PM

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