1970 d 200 running light problems

Wiring, lights, heater controls, anything electrical..
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caliveltz

1970 d 200 running light problems

Post by caliveltz »

hello,
i own a 1970 d200. we have just replaced the complete turn signal switch in the column with a nos mopar unit to fix the "one brake light" problem. both brake lights work great and my signals both work great. my new problem is that when i want to drive at night and i put the headlights on and press the brake pedal or signal right or left, the front and rear running lights short out, popping the fuse. the headlights themselves still work fine.
thanks a lot for the help!
james veltri
san marcos, california

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cowboy
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Post by cowboy »

James :welcome to the site , if you just replaced you T swetch & all this started , you eather have a wire crossed or a wire grounding out both the T signiles & brake lights are the same just go back & double check your work
:usa
cowboy Alvin Tx
67 w100 318 3spd
2005 Ram 2500 CC Diesel 4x4 lwb
LAND OF THE FREE
BECAUSE OF THE BRAVE

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Jeffc
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Post by Jeffc »

All running lights are a differant system than the signal/brake lights
though they run to the same light buckets.
Got something plugged in wrong or cross wired that should not be.
Need to check all those green and yellow wires to make sure that
everything is were it belongs and make sure your power from the
light switch is using the right power feed.... and the one that
feeds the brake also.
http://imageevent.com/jeffc
62 D100 225 3sp lwb
64 D100 A318 727pb custom lwb
66 D100 A318 4sp lwb
68 D100 B383 727 swb
65 Dart GT LA273 2bbl 904
73 Scamp 225 2bbl 4sp od
68 P300 318 727 base Oasis 22' RV
71 for sale D200 318 auto parts truck could be fixed compleat $400
Old iron or no iron!
One size does NOT fit all!

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Jeffc
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Post by Jeffc »

Just had a thought, has this truck ever been wired for
a trailor??
http://imageevent.com/jeffc
62 D100 225 3sp lwb
64 D100 A318 727pb custom lwb
66 D100 A318 4sp lwb
68 D100 B383 727 swb
65 Dart GT LA273 2bbl 904
73 Scamp 225 2bbl 4sp od
68 P300 318 727 base Oasis 22' RV
71 for sale D200 318 auto parts truck could be fixed compleat $400
Old iron or no iron!
One size does NOT fit all!

caliveltz

running light problems

Post by caliveltz »

the truck has the new style four prong trailer connector. i just am so frustrated by this :banghead . thanks for all of your comments and keep them coming!
james veltri
san marcos, ca

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Jeffc
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Post by Jeffc »

I was trying to think of were the running lights and signals
might be crossed and one of the more common places that
can happen would be at a the wiring at a trailer plug.
Only way to check this is to pull the plug out and remove all
the wires and check to see if it still pops the fuse.
For fuses to blow, you have to have a dead ground and for
it to happen with the brake/signals and the running lights
it needs to involve both, little odd for it to happen when
one system works ok till the other system is on.
http://imageevent.com/jeffc
62 D100 225 3sp lwb
64 D100 A318 727pb custom lwb
66 D100 A318 4sp lwb
68 D100 B383 727 swb
65 Dart GT LA273 2bbl 904
73 Scamp 225 2bbl 4sp od
68 P300 318 727 base Oasis 22' RV
71 for sale D200 318 auto parts truck could be fixed compleat $400
Old iron or no iron!
One size does NOT fit all!

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Seabee
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Post by Seabee »

I've been mulling this one over as well. It seems odd that both systems operate normally alone, but fuse blows when both operate. Fuse will blow for only one reason; overcurrent. This may be caused by "short" to ground, or by too high a load.
I'll try to find time to print out the diagram and hi-light the paths.

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oneowner71
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Post by oneowner71 »

I'm having one of those days, but it makes for creative thinking. If they work good when only one system is on by itself, then there has to be a bridge between the two systems to short them out when one is connected. You turn the lights on and it completes one circuit and runs one feed to the tailights/turn indicators. If you hit the brakes or signal, it completes a different circuit that send a separate signal to the same lights. Could it be possible that one circuit is using the other for ground until that circuit is opened, at which time the fuse blows? If the only thing you changed is the turn signal switch, then it would have to have something to do with that. Could you have pinched a wire or possibly have a broken main connector that is combining circuits?.. I'm kinda just thinking out loud, but maybe it will spark someone that actually knows what they are talking about...
Thanks, Clint
1971 D-100, 318 3-spd
1970 Dude, 383 / A727
1974 Challenger, 383/A727 (451 5-speed, someday)
1971 Plymouth Satellite,
2002 Dodge Ram 1500 Quadcab

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