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Username Post: Dash lights missing - light switch controls fuel and temp gauges        (Topic#357214)
Gaspains 
"5th Year" Gold Supporting Member
Posts: 317
Gaspains
Loc: Mankato, MN
Reg: 11-23-09
07-13-19 05:20 PM - Post#2770630    

It's been a fun couple of days. I can fix mechanical stuff all day long, but electrical s**cks.

The situation: no dash lights in the dash behind the bezel. Lights work in the radio and heater control. Gauges work correctly with ignition key on. BUT, the fuel and temperature gauges respond to movement of the rheostat on the light switch when I pull the lights to park or headlights. The amp meter seems affected but indirectly compared to the other two.

In addition, the indicators in the dash for the left and right turn signals, the parking brake and the high beam all come on when I turn on either the park or head lights. The rheostat affects the brightness of these as well.

If the lights aren't on, the left/right and parking indicators work normally. I can't check the high beam without turning the lights on and...

I'm guessing I might have a connection swapped on the light switch. That's my first shot. Is there any other place that would bring the normally-off indicating lights and the gauge cluster power from the variable side of the interior light switch?

Sorry, long post. I thought about splitting this up but the variability seems to tie the two conditions together.

Kevin
1965 Impala SS Coupe
Regal Red with Black Interior
L74 327
M-20
3.31 Open, 12 bolt

65-66 FSCC #512
NIA #2832


 
Ecklers AutoMotive
bigbowtielover 
Valued Contributor
Posts: 2540
bigbowtielover
Loc: Surrey British Columbia
Reg: 09-01-13
07-13-19 08:00 PM - Post#2770638    
    In response to Gaspains

Ground strap on cluster making good contact? It is located near clock hole(tach or vac gauge on SS).



 
Gaspains 
"5th Year" Gold Supporting Member
Posts: 317
Gaspains
Loc: Mankato, MN
Reg: 11-23-09
07-13-19 08:08 PM - Post#2770640    
    In response to bigbowtielover

I’ll take a look. Can’t believe how important grounding is in these cars. Thanks.

Kevin
1965 Impala SS Coupe
Regal Red with Black Interior
L74 327
M-20
3.31 Open, 12 bolt

65-66 FSCC #512
NIA #2832


 
Gaspains 
"5th Year" Gold Supporting Member
Posts: 317
Gaspains
Loc: Mankato, MN
Reg: 11-23-09
08-06-19 03:13 PM - Post#2772560    
    In response to Gaspains

It WAS dash grounding! I checked all connections per the schematic. All OK. Re-seated all connectors. Still goofy. THEN I ran a temporary ground to the cluster. The gremlins disappeared. So I brightened the sheet metal under the ground point at the speedometer/gauge cluster. They came back. Finally I just built a really good grounding strap and tied the cluster ground to a known good grounding bolt on the lower dash. Problem solved. Thank God because I'm tired of looking at schematics.

Thanks for the encouragement to check grounding. Next time, God forbid, I'll do it first.

Kevin
1965 Impala SS Coupe
Regal Red with Black Interior
L74 327
M-20
3.31 Open, 12 bolt

65-66 FSCC #512
NIA #2832


 
Ecklers AutoMotive
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