Need elictrical help - Ford Bronco Forum
 
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post #1 of 8 (permalink) Old 12-09-2016, 05:28 PM Thread Starter
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Need elictrical help

I need an electrical guru. When I hit the brakes in my 78 the marker lights and the dash lights illuminate. Then when I have my turn signal on the emergency flashers are going until I step on the brake then the turn signal works. Any ideas? Thank you.

Last edited by shustring; 12-09-2016 at 05:43 PM.
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post #2 of 8 (permalink) Old 12-09-2016, 07:06 PM
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Yo shustring,

Troubleshooting; If you have a problem when turning on one circuit it causes another to come on partially (dim lights, etc.), check the ground for the part or system that was turned on first. i.e., if you press the brake pedal & the parking lights turn on partially or fully, check the brake lights' ground; This is caused by current going through brake light bulb filaments & finding a ground in the parking lt. system instead of its own ground.
This will help, 79 Bronco Wiring Diagram by Ford via topsig


Marker light wiring diagrams begin on this page

Ground is G801, shared with driver side headlight, driverside front parking lights, etc.
G802 is shared with passenger side frontbparking & marker lights

Ground locations described on this page:



Brake circuit on this page:



BRAKE LIGHTS
With trailer tow is G1002 for passenger side
Without tt the socket is grounded
With trailer tow is G1001 for driver side
Without tt the socket is grounded
...
Check sockets for corrosion.
Have to stop now.

Also saw that you may extend your driveshaft. We bought one for our ex 78 from https://m.facebook.com/pages/Dicks-D...63896800302686
Great service!

See my partially recovered Bronco web site ...Will need to clean up dead links & add many more new links some day. Thanks to Mr. Schwim!
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post #3 of 8 (permalink) Old 12-09-2016, 07:44 PM
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Never mind. I erred.
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post #4 of 8 (permalink) Old 01-08-2017, 10:02 PM Thread Starter
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So when I was in Afghanistan I picked up a couple of LED lights off of an MRAP. I want to pit them on the 78 but they are 28v. Would a step up converter of some kind work?I dont think they have too much current being an aled.
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post #5 of 8 (permalink) Old 01-08-2017, 10:04 PM Thread Starter
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Quote:
Originally Posted by miesk5 View Post
Yo shustring,

Troubleshooting; If you have a problem when turning on one circuit it causes another to come on partially (dim lights, etc.), check the ground for the part or system that was turned on first. i.e., if you press the brake pedal & the parking lights turn on partially or fully, check the brake lights' ground; This is caused by current going through brake light bulb filaments & finding a ground in the parking lt. system instead of its own ground.
This will help, 79 Bronco Wiring Diagram by Ford via topsig


Marker light wiring diagrams begin on this page

Ground is G801, shared with driver side headlight, driverside front parking lights, etc.
G802 is shared with passenger side frontbparking & marker lights

Ground locations described on this page:



Brake circuit on this page:



BRAKE LIGHTS
With trailer tow is G1002 for passenger side
Without tt the socket is grounded
With trailer tow is G1001 for driver side
Without tt the socket is grounded
...
Check sockets for corrosion.
Have to stop now.

Also saw that you may extend your driveshaft. We bought one for our ex 78 from https://m.facebook.com/pages/Dicks-D...63896800302686
Great service!
Thank you for your help. I have a friend here that does drive lines so I wont have a problem there, Thanks.
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post #6 of 8 (permalink) Old 01-10-2017, 11:01 PM
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See if you can find the same LED bulb in 12V and just switch the bulbs over?

3G Alt. Upgrade, Duel Batteries, 351M bored .030 over with Edlebrock cam and intake, C-6 w/AO4D internals, 3" lift w/RS 9000, 33x12.50 MTR's, Saginaw PS Pump Conversion, On Board Air, Detroit Locker, Hydro Boost Brake System, Altimeter from a CH-46D, Map Light from a MH-53E.

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post #7 of 8 (permalink) Old 01-11-2017, 08:29 PM Thread Starter
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Quote:
Originally Posted by Ziggy View Post
See if you can find the same LED bulb in 12V and just switch the bulbs over?
They are sealed units. There are about ten lamps in each one. But it would have been a good idea.
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post #8 of 8 (permalink) Old 01-12-2017, 02:01 AM
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This might do the trick - 12V to 24V Step Up | eBay

3G Alt. Upgrade, Duel Batteries, 351M bored .030 over with Edlebrock cam and intake, C-6 w/AO4D internals, 3" lift w/RS 9000, 33x12.50 MTR's, Saginaw PS Pump Conversion, On Board Air, Detroit Locker, Hydro Boost Brake System, Altimeter from a CH-46D, Map Light from a MH-53E.

U. S. Government - Wasting paper and keeping Lumber Jacks gainfully employed since 1776.
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