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10-24-2020, 12:11 PM
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CC Member
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Join Date: May 2015
Posts: 626
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Not Ranked
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
__________________
Superformance 1764
Ford Racing 427 SB
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10-24-2020, 12:34 PM
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CC Member
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Join Date: Feb 2018
Location: Lodi,
CA
Cobra Make, Engine: 427 manowar forged crank roller rockers . BIG CAM.
Posts: 785
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Not Ranked
check for ground issues
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10-24-2020, 12:47 PM
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CC Member
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Join Date: May 2002
Location: SF, Bay Area,
CA
Cobra Make, Engine: SPF832, 466cid
Posts: 501
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Not Ranked
Didn't see fuses mentioned.
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10-24-2020, 12:57 PM
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CC Member
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Join Date: May 2015
Posts: 626
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All under dash fuses good
Quote:
Originally Posted by NROTOXIN
Didn't see fuses mentioned.
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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
__________________
Superformance 1764
Ford Racing 427 SB
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10-24-2020, 01:06 PM
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Senile Club Cobra Member
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Join Date: Feb 2001
Location: Buffalo, NY USA,
NY
Cobra Make, Engine: Superformance
Posts: 4,536
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Not Ranked
Quote:
Originally Posted by tortuga
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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You need the wire diagrams from Blas, all will revealed! spfwiringdiagrams@comcast.net
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"I'm high all right, but on the real thing....powerful gasoline and a clean windshield..."
rick@autoventureusa.net
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10-24-2020, 01:55 PM
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CC Member
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Join Date: May 2002
Location: SF, Bay Area,
CA
Cobra Make, Engine: SPF832, 466cid
Posts: 501
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Not Ranked
Quote:
Originally Posted by tortuga
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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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. |
10-24-2020, 02:34 PM
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CC Member
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Join Date: May 2015
Posts: 626
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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?
__________________
Superformance 1764
Ford Racing 427 SB
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10-24-2020, 03:35 PM
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CC Member
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Join Date: May 2015
Posts: 626
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Not Ranked
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
__________________
Superformance 1764
Ford Racing 427 SB
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10-24-2020, 05:25 PM
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CC Member
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Join Date: Jan 2009
Location: Las Vegas,
NV
Cobra Make, Engine: Shelby CSX4005LA, Roush 427IR
Posts: 5,585
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Not Ranked
Under the dash? Check the connections on the light switch.
Whatever it was, it'll be back.
__________________
Cheers,
Tony
CSX4005LA
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10-30-2020, 07:50 PM
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CC Member
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Join Date: Mar 2012
Location: Mississauga,
Ont
Cobra Make, Engine: Midland, 302
Posts: 11
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Not Ranked
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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