Have been a Very Firm Believer in VOMs most of My life > Until Today ~ Another BackUp Light Issue ~ Only this 1 is Switch Related ~ Have a Friends 87Westy @ My Place that I am doing a bunch of Stuff to & while moving it last night discovered that the B'U'Lights were not working ~ Bulbs checked out OK so I pulled the wires off the Switch, Jumped them & the Lights Worked ~ Found Used Spare that I had & put a VOM to it to see if it was OK & it showed roughly 325 Ohms when pressed so figured it ought to pretty much be usable ~ Put it in & the B'U'Lights worked Just Fine ~ Decided to VOM the Old "Bad" Switch & was Quite Surprised when it showed a DeadShort when pressed ~ Decided to put it back in only to find that it Produced No Lights ~ Put My Spare back in & I get Lights ~ ReVOMed "Bad" Switch > DeadShort > Put It back In > No Lights ~ My UsedSpare is now in place & the B'U'Lights are Working Nicely ~ ORR ~ DeanB
On 11 Apr , 2017, at 2:11 PM, David Beierl wrote: > Your voltmeter should be able to tell you where the problem lies. > > Yrs, > d > > On Tue, Apr 11, 2017 at 3:42 PM, Stuart MacMillan <stuartmacm@gmail.com> > wrote: > >> Yeah, DC circuits are famous for floating currents when grounds are >> disrupted. I'll replace the ground wires and connectors and see what >> happens. >> >> Stuart >> >> -----Original Message----- >> From: Dennis Haynes [mailto:d23haynes57@hotmail.com] >> Sent: Monday, April 10, 2017 6:42 PM >> To: Stuart MacMillan; vanagon@GERRY.VANAGON.COM >> Subject: RE: Backup light puzzle anyone? >> >> You need to look at the grounds at one of the rear sockets. Resistance at >> the grounds is putting the 2 lamps in series from the other bulbs giving >> you >> the half voltage causing the low current sensitivity of the LEDs to light >> up. >> >> Dennis >> >> >> -----Original Message----- >> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of >> Stuart MacMillan >> Sent: Monday, April 10, 2017 9:09 PM >> To: vanagon@GERRY.VANAGON.COM >> Subject: Backup light puzzle anyone? >> >> I got a pair of LED back up "bulbs" along with the other LEDs for my '85 >> automatic transmission Vanagon, and they are on all the time when ignition >> is on (other bulbs work fine). The switch on the selector is brand new >> (both >> parts), but there is a constant 5v at the backup lights and at the switched >> contact on the selector switch, and the proper 12 volts on the power side. >> 5v is enough to illuminate the LEDs. >> >> >> >> There has to be some kind of short in the wiring between the switch and the >> lights, but where would that wire pick up 5 volts? The rear taillight >> light >> assemblies are in excellent condition and I've re-done the ground at the >> left taillight. >> >> >> >> I've had to go back to the filament bulbs until I can figure this one out. >> Or maybe just forget about the LEDs because the short is probably buried >> somewhere in the wrapped harness under the van. >> >> >> >> No end to the fun! >> >> >> >> Stuart >> |
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