Rewiring OEM Instrument Cluster 75 FJ40 (1 Viewer)

BDSeff1fitty

1982 Toyota Pickup
Joined
Nov 12, 2008
Messages
1,925
Location
Houston, Texas
Have installed the 20 circuit Painless harness. Just finished up today. I saw where someone was looking for instructions on wiring the OEM instrument cluster. I'll describe what I did, and hopefully it will be enough to be helpful even if you didn't do exactly as I did.

1. I took the instrument cluster out, and removed the 12 pin circular connector, and the two wires to the ammeter.

2. I took each of the lamps out of the instrument cluster and used very fine emery paper to clean the copper pads as mine had corroded up pretty well. Likewise I removed the nouts on the instruments (fuel guage, temp guage and oil guage. I cleaned the copper pads on these as well. Finally, I cleaned each of the 12 pins with emery paper wher ethe circular connector goes.

3. I cut the wires off the old harness where the round connector was, leaving about 4 inches of wire. (I had put all new vintage connectors everywhere else on the vehicle, but couldn't find this round connector so had to spilce the old connector wires onto the new wires.

4. I in-line twisted each wire to the new one, soldered, and slid weatherproof heatshrink over each solder joint to insulate them.

5. The Painless harness does not explicitely provide a switched power wire to the instrument cluster, nor does it provide a ground. You'll need both.

6. Here'e the wiring:

Pin -- Old color -- New Color -- Function

1 -- White/Black -- Black -- Ground

2 -- Yellow/Black -- Lt Blue/Black #722 -- Oil Sender

3 -- not used

4 -- Blue/Red -- Red/Blk -- Battery + (switched)

5 -- Yellow/Red -- Pink #739 -- Fuel Sender

6 -- Yellow/Green -- Lt Green #721 -- Temp Sender

7 -- Red/Yellow -- Green #736 -- Hi Beam Indicator

8 -- Blue/White -- (I didn't used) -- Veh Speed sensor to emission box

9 -- Green/Yellow -- Dk blue #738 -- Right turn indicator

10 -- not used

11 -- Green/Black -- Lt Blu #737 -- Left turn indicator

12 -- Red/Black -- Brown #730 -- Instr Panel Light

All seems to work fine.
 
Last edited:
Joined
Apr 22, 2007
Messages
1,286
Location
Carpinteria, CA
Dont suppose you took a picture of the back of the cluster after it got wired? So did you use the round connector? I dont have one on mine so im looking for alternatives.
Thanks
Paul
 
Joined
Jun 25, 2011
Messages
1
Location
huntington beach, CA
first post on the board been lurking a while

im in the process of doing my 75 with an ez wiring harness

i did the same reusing the round conector but my harness did have the instrument power, i did have to add a ground ootherwise it will ground through the turn signals

and i do have the comment of the ez/painless harnesses are anything but

side note:
i went to the junkyard and got a gm steering column conector
and light switch connector
and bought the gm light switch from pepboys $10.95
 

BDSeff1fitty

1982 Toyota Pickup
Joined
Nov 12, 2008
Messages
1,925
Location
Houston, Texas
There's another post on here recently that had some pics. For many of the points, the terminal screw also exists in addition to the connection on the round connector, so you could wire directly there (all the instrument gauges). You can also use single barrel connectors that will fit over the individual pins. Frys Electronics sells some Molex connectors that have the female barrels included that would probably work.

If we end up pulling the panel back out over the next few days, I'll take a few pics.
 
Joined
Mar 7, 2011
Messages
4
Location
TEXAS
Painless wiring Hazard Switch

i have some pain in my Painless regarding the Hazard Warning Switch, any advice would be great
 
Joined
Dec 30, 2014
Messages
655
Location
Boise, Idaho
Have installed the 20 circuit Painless harness. Just finished up today. I saw where someone was looking for instructions on wiring the OEM instrument cluster. I'll describe what I did, and hopefully it will be enough to be helpful even if you didn't do exactly as I did.

1. I took the instrument cluster out, and removed the 12 pin circular connector, and the two wires to the ammeter.

2. I took each of the lamps out of the instrument cluster and used very fine emery paper to clean the copper pads as mine had corroded up pretty well. Likewise I removed the nouts on the instruments (fuel guage, temp guage and oil guage. I cleaned the copper pads on these as well. Finally, I cleaned each of the 12 pins with emery paper wher ethe circular connector goes.

3. I cut the wires off the old harness where the round connector was, leaving about 4 inches of wire. (I had put all new vintage connectors everywhere else on the vehicle, but couldn't find this round connector so had to spilce the old connector wires onto the new wires.

4. I in-line twisted each wire to the new one, soldered, and slid weatherproof heatshrink over each solder joint to insulate them.

5. The Painless harness does not explicitely provide a switched power wire to the instrument cluster, nor does it provide a ground. You'll need both.

6. Here'e the wiring:

Pin -- Old color -- New Color -- Function

1 -- White/Black -- Black -- Ground

2 -- Yellow/Black -- Lt Blue/Black #722 -- Oil Sender

3 -- not used

4 -- Blue/Red -- Red/Blk -- Battery + (switched)

5 -- Yellow/Red -- Pink #739 -- Fuel Sender

6 -- Yellow/Green -- Lt Green #721 -- Temp Sender

7 -- Red/Yellow -- Green #736 -- Hi Beam Indicator

8 -- Blue/White -- (I didn't used) -- Veh Speed sensor to emission box

9 -- Green/Yellow -- Dk blue #738 -- Right turn indicator

10 -- not used

11 -- Green/Black -- Lt Blu #737 -- Left turn indicator

12 -- Red/Black -- Brown #730 -- Instr Panel Light

All seems to work fine.

hello,
I know this is an old thread, but how Did you reconnect the ammeter?
did you ever post pics?
thank you
 

ToyotaMatt

Factory Focus-Point Mind-Set Approach
Supporting Vendor
GOLD Star
Joined
Aug 12, 2007
Messages
13,591
Location
EAST COAST
Have installed the 20 circuit Painless harness. Just finished up today. I saw where someone was looking for instructions on wiring the OEM instrument cluster. I'll describe what I did, and hopefully it will be enough to be helpful even if you didn't do exactly as I did.

1. I took the instrument cluster out, and removed the 12 pin circular connector, and the two wires to the ammeter.

2. I took each of the lamps out of the instrument cluster and used very fine emery paper to clean the copper pads as mine had corroded up pretty well. Likewise I removed the nouts on the instruments (fuel guage, temp guage and oil guage. I cleaned the copper pads on these as well. Finally, I cleaned each of the 12 pins with emery paper wher ethe circular connector goes.

3. I cut the wires off the old harness where the round connector was, leaving about 4 inches of wire. (I had put all new vintage connectors everywhere else on the vehicle, but couldn't find this round connector so had to spilce the old connector wires onto the new wires.

4. I in-line twisted each wire to the new one, soldered, and slid weatherproof heatshrink over each solder joint to insulate them.

5. The Painless harness does not explicitely provide a switched power wire to the instrument cluster, nor does it provide a ground. You'll need both.

6. Here'e the wiring:

Pin -- Old color -- New Color -- Function

1 -- White/Black -- Black -- Ground

2 -- Yellow/Black -- Lt Blue/Black #722 -- Oil Sender

3 -- not used

4 -- Blue/Red -- Red/Blk -- Battery + (switched)

5 -- Yellow/Red -- Pink #739 -- Fuel Sender

6 -- Yellow/Green -- Lt Green #721 -- Temp Sender

7 -- Red/Yellow -- Green #736 -- Hi Beam Indicator

8 -- Blue/White -- (I didn't used) -- Veh Speed sensor to emission box

9 -- Green/Yellow -- Dk blue #738 -- Right turn indicator

10 -- not used

11 -- Green/Black -- Lt Blu #737 -- Left turn indicator

12 -- Red/Black -- Brown #730 -- Instr Panel Light

All seems to work fine.


perhaps you take a close look at this and approach it from a factory oem correct way , ZERO guess work plug and pay with your painless ........

done




1614077272177.png

1614077366804.png
 

Users who are viewing this thread

Top Bottom