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December 2020
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  #1 (permalink)  
Old 10-24-2020, 12:11 PM
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Default Spf electrical issue:

Went to leave a friends place last night, no lights.

Switch checks out good,
Blinkers & brake lights work,
High beam flash works, no high beams solid
No running lights fore or aft,
No gauge lights

Will the headlight relay going out cause this?

Thanks
Steve H
1764
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Daytona sensors ign box locked dist 20*-34* @2800
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  #2 (permalink)  
Old 10-24-2020, 12:34 PM
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Default

check for ground issues
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  #3 (permalink)  
Old 10-24-2020, 12:47 PM
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Didn't see fuses mentioned.
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  #4 (permalink)  
Old 10-24-2020, 12:57 PM
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Default All under dash fuses good

Quote:
Originally Posted by NROTOXIN View Post
Didn't see fuses mentioned.
Ground in lh wheel well and under dash look good...

Kind of suspect relay; on the switch there is a red wire which shows system volts, ablue that should turn on headlights, and a grey/black that is for gauges and running lights? Shorting the hot to either of these does nothing...well actually writing this, if the relay was bad the gauges and running (marker and tails) should come on?

Sure seems like a ground...

Where does the lighting system ground?

Thanks
Steve H
1764
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Superformance 1764
Ford Racing 427 SB
Z304P heads Ti valves
Trick Flow R Manifold
Holley xp 750 Annular Mech
Full Cobra Valley Suspension, Ball Jts, Rear mount, rear heim, coil overs, sways...
Daytona sensors ign box locked dist 20*-34* @2800
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  #5 (permalink)  
Old 10-24-2020, 01:06 PM
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Quote:
Originally Posted by tortuga View Post
Ground in lh wheel well and under dash look good...

Kind of suspect relay; on the switch there is a red wire which shows system volts, ablue that should turn on headlights, and a grey/black that is for gauges and running lights? Shorting the hot to either of these does nothing...well actually writing this, if the relay was bad the gauges and running (marker and tails) should come on?

Sure seems like a ground...

Where does the lighting system ground?

Thanks
Steve H
1764
You need the wire diagrams from Blas, all will revealed! spfwiringdiagrams@comcast.net
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  #6 (permalink)  
Old 10-24-2020, 01:55 PM
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Quote:
Originally Posted by tortuga View Post
Ground in lh wheel well and under dash look good...

Kind of suspect relay; on the switch there is a red wire which shows system volts, ablue that should turn on headlights, and a grey/black that is for gauges and running lights? Shorting the hot to either of these does nothing...well actually writing this, if the relay was bad the gauges and running (marker and tails) should come on?

Sure seems like a ground...

Where does the lighting system ground?

Thanks
Steve H
1764
Do you have voltage at the switch and relay? They get their source voltage from separate fuses. if you don't have a DVM or test light to verify.....you're just guessing.
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  #7 (permalink)  
Old 10-24-2020, 02:34 PM
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Default Yes have a DVM

Have system volts to switch,
Testing the switch for continuity shows the int position connecting to power tab for the gauges and markers
And connecting to headlights in full position...
BUT
Shorting the power wire to either wire does nothing?

Will relay failing kill everything?
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Superformance 1764
Ford Racing 427 SB
Z304P heads Ti valves
Trick Flow R Manifold
Holley xp 750 Annular Mech
Full Cobra Valley Suspension, Ball Jts, Rear mount, rear heim, coil overs, sways...
Daytona sensors ign box locked dist 20*-34* @2800
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  #8 (permalink)  
Old 10-24-2020, 03:35 PM
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Default Just started working again...

Under there wiggling and testing and viola lights on, sure wish i knew what i did.

Yet another thing not to trust...

F me

Thanks for the help fellas

Steve H
1764
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Superformance 1764
Ford Racing 427 SB
Z304P heads Ti valves
Trick Flow R Manifold
Holley xp 750 Annular Mech
Full Cobra Valley Suspension, Ball Jts, Rear mount, rear heim, coil overs, sways...
Daytona sensors ign box locked dist 20*-34* @2800
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  #9 (permalink)  
Old 10-24-2020, 05:25 PM
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Under the dash? Check the connections on the light switch.

Whatever it was, it'll be back.
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  #10 (permalink)  
Old 10-30-2020, 07:50 PM
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Usually with electrical devices or circuits they work or they dont unfortunately there is no warning. Some testing is in order, time consuming but necessary. Good luck
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