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Testing the connections on the rear fender tail brake light and front fender park turn signal lights.
Light power lead through meter to ground …continuity (as it should be.)
Light power lead to the other light power lead…continuity
(as it should not be.)
The brake and tail light circuits are separate but I get continuity through both power wires. I should not. That indicates a connection between the brake filament and the tail light filament without ground. Am I missing something?Allen Caron
VW based 53MGTD - "MoneyPenny"
"If one thing matters, everything matters" - from the book The ShackAll lights checked were not hooked up to the rest of the harness. Just checking continuity before hooking them up. This threw me off. If I get continuity through both hot leads then the fuse will blow wont it?
Allen Caron
VW based 53MGTD - "MoneyPenny"
"If one thing matters, everything matters" - from the book The ShackAlan, I’m having trouble understanding your terminology. If you have the bulbs installed, you would expect “continuity” on the hots to ground. If any two bulbs are grounded, then if you read hot 1 to hot 2 – yep, even though different circuits, you will expect a reading.
Royal2015-04-04 20:38:12Take the brake and tail light bulb. One bulb, two filaments and two hot leads.
Hot lead to ground…good.
Other hot lead to ground…good.
One hot lead to the other hot lead…continuity. If I understand correctly I should not have continuity but I do. Shouldn’t one hot lead to the other hot lead be open?Allen Caron
VW based 53MGTD - "MoneyPenny"
"If one thing matters, everything matters" - from the book The ShackNo. Not if they share a common ground. The base itself is a common ground for both filaments.
I’m not convinced you have a problem..
Royal2015-04-04 21:10:32
I’ll check it out tomorrow with power. May not have a problem as all four lights are this way. I’ll post results tomorrow. Till then……..Go Badgers! And to all our members have a blessed and Happy Easter!
Don’t eat to many Peeps!
Allen Caron
VW based 53MGTD - "MoneyPenny"
"If one thing matters, everything matters" - from the book The ShackMakes more sense to me now, bulb only and no wires involved (other than filaments).
What Roy said would be right, I believe, so that when you test just the pair of contacts they aren’t actually isolated to themselves. The bulb base is their mutual ground and completes the circuit.Imagine each filament support wire going to a contact and other side going to metal base, making a closed loop if you cross the contacts.Not that I really know this to be true, just seems right to me.LRH2015-04-05 01:06:59
Findings. (Roy and LHR you were correct.)
Final ohm check as follows:
Bulb out of socket…
ground to ground – continuity.
hot leads to ground – open.
hot lead to hot lead – open.Bulb in socket…|
ground to ground – continuity.
hot leads to ground – continuity.
hot lead to other hot lead – continuity.
(must go through common ground of the bulb base.)Power on check as follows:
light switch off – bulbs off.
light switch on – parking lights and tail lights – on; brake lights off.
light switch off – brake pedal depressed – parking lights and tail lights – off; brake lights on.
light switch on – brake pedal depressed – parking and tail lights – on brake lights on and no fuse blown.Hopefully this will help someone else should they run across this.
Learning all the time!
Allen Caron
VW based 53MGTD - "MoneyPenny"
"If one thing matters, everything matters" - from the book The Shack
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