The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Help- both turn signal indicators turn on when lights are on

speedygonzales · 10-12-2015, 09:02 AM

When you checked the grounds, did you actually take measurements?

Did you check the ground connection to the indicator lights?

With regard to charging or not charging. If the alternator is working properly and all the connections are made to it correctly and the battery, there is no way anything stock should cause it to not charge correctly. Only added drain could do that. For example a cooling fan for the radiator that runs all the time, or one of those big thumping amps. A short for example, would either blow a fuse or melt a wire. Running voltage through a device that was intended to be there can not do what your suggesting.

Did you check battery/alt voltage at different points? ie. across both battery terminals, then positive battery terminal to frame rail, then positive battery terminal to engine block, Alt output post to frame rail, alt output post to engine block and last alt output post to negative battery terminal? By doing this I discovered a charging problem the dealer missed.

I don't know why your wiring is not matching the drawing. Is the drawing a different year or has your truck wiring been changed, or is the wiring of the truck faded color?

Regardless of wiring color, there is one thing that should be the same. That is, the color of the wire going to the side marker light should match the color of the wire going to the indicator light. Does it match?

10-12-2015, 09:02 AM	#11
speedygonzales Registered User Join Date: Jan 2006 Location: Smithfield, VA Posts: 1,501	Re: Help- both turn signal indicators turn on when lights are on When you checked the grounds, did you actually take measurements? Did you check the ground connection to the indicator lights? With regard to charging or not charging. If the alternator is working properly and all the connections are made to it correctly and the battery, there is no way anything stock should cause it to not charge correctly. Only added drain could do that. For example a cooling fan for the radiator that runs all the time, or one of those big thumping amps. A short for example, would either blow a fuse or melt a wire. Running voltage through a device that was intended to be there can not do what your suggesting. Did you check battery/alt voltage at different points? ie. across both battery terminals, then positive battery terminal to frame rail, then positive battery terminal to engine block, Alt output post to frame rail, alt output post to engine block and last alt output post to negative battery terminal? By doing this I discovered a charging problem the dealer missed. I don't know why your wiring is not matching the drawing. Is the drawing a different year or has your truck wiring been changed, or is the wiring of the truck faded color? Regardless of wiring color, there is one thing that should be the same. That is, the color of the wire going to the side marker light should match the color of the wire going to the indicator light. Does it match? __________________ 99 Z71 (98 body style) Pride and joy Last edited by speedygonzales; 10-12-2015 at 09:09 AM.