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Banned
Join Date: Nov 2001
Location: top of 3rd
Posts: 4,336
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H1 lowbeams blowing both fuses
I recently installed H1's - they were dusty barn find condition, but very much diamond's in the rough
I plugged them in w/ the JWest pigtail adapters (4prong harness to 3prong light) and they worked fine, maybe tad bit dim disassembled them, cleaned them up and they turned out spectacular - just a simple dusting returned them to excellent condition I cleaned the contacts and plugged them in, and blew both 8amp fuses high beams work fine my hi/lo stalk had been wonky for years (copper contacts not touching right and lo's would turn off over bumps, despite my fiddling w/ them) so we metered the harness yesterday and all was fine connected each light to the battery and they lit up swapped out the stalk yesterday (what a colossal arsefukk that was!) figuring it had to be that (tho not sure why suddenly as it'd worked in wonky mode for over a year)... blew both fuses I'm pretty frustrated as this is now beyond my skill set (limited), and I depart Thurs for der 'PALOOZA and the thought of having to go running just fogs for lows sucks nads can anyone please try to help me figure this out? I figured it had to be a ground issue but like I said I cleaned them... and they weren't bad to begin with actually. TIA all!... |
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Member 911 Anonymous
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In your pic, the upper copper strap is your Lo-Beam ground strap making contact with the coiled adjuster, you have to insure the adjuster coil is free from corrosion and that the adjuster screw also is cleanly making contact with the outer rim which via the hold down bottom screw makes a complete circuit to the chassis.
You can test this by rigging a wire to the strap then grounding it the chassis. I had to modify mine because my adjust coil snapped.
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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Banned
Join Date: Nov 2001
Location: top of 3rd
Posts: 4,336
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thanks for that tip - just pulled them and had a look... all's fine in there but I did scuff up all the grounds again just in case
however instead of screwing the units back into the buckets w/ the mounting screw, I just hung them loosely and tested the lights this resulted in one low working fine and it's high coming on dimly, and the other low coming on dimly, and that low coming on dimly when I touched the unit, it made contact w/ the painted bucket 'catch' atop the fender there and made small sparks I turned it all off, screwed them up, and hoped I'd solved it nope blew the fuses again what is this telling me? ugh - frustrating thanks again for any insight here... I need the help as I depart for turboPALOOZA Thurs and hate to just run hi's / fogs.. |
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Registered
Join Date: Oct 2013
Location: Prescott, AZ
Posts: 1,062
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Sounds like a polarity reversal. Maybe Draco knows how to check for this. Could it be reversed somehow at the switch?
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I would rather be driving
Join Date: Apr 2000
Location: Austin, TX
Posts: 9,108
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Check the wiring. I can't follow the wiring through the black shroud but it looks like you have switched the low beam and ground. verify that they match the connector side. Here is what they should be.
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Jamie - I can explain it to you. But I can not understand it for you. 71 911T SWT - Sun and Fun Mobile 72 911T project car. "Minne" - A tangy version of tangerine #projectminne classicautowerks.com - EFI conversion parts and suspension setups. IG Classicautowerks |
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Banned
Join Date: Nov 2001
Location: top of 3rd
Posts: 4,336
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thanks guys
I did not change any of the terminals / pins... worked before... then merely took H1's apart and reassembled... meaning... the only wire I took off was the ground. the rest of the wires remained in their locations just got in, my RF signal wasn't working so I pulled the lense - saw the filament glowing but not lighting up - followed the wire up to the bucket into the clear connectors and wiggled/pressed and it solved that had hoped it was my issue nope signals fine / blew more fuses awesome gdammit! |
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Registered User
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Without switching headlamps on try measuring the resistance to ground at each of the terminals as shown in the excellent pictures above. Even if you have not changed the wiring of the H1s there must be a short to ground on the yellow wire. You need to work out what is causing that short. Once solved all should be good.
Cheers and good luck, Neil |
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Banned
Join Date: Nov 2001
Location: top of 3rd
Posts: 4,336
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my multimeter's not working - awesome
so I tried thinking thru things I've touched (car was recently in a quadzillion pieces w/ motor out and FMOC install and I've yanked A/C and washer pump and rear wiper etc.) still no lowbeams relays didn't help, nor was it my washer pump spades grounding as I'd hoped they were - I'd forgotten they were there and to tape them up Tomorrow I'm going to look @ my rear plate light wires - they're tucked up "in thar somewhere" from DoubleDMastectomy, maybe / hopefully I pinched something whilst reinstalling the bumper. Racking mah feeble noggin here trying to think thru what I touched or what it could be. Already taped up the washer pump spades, oil cooler fan plug (not exposed tho), and rear wiper wire... hmmm, may be a leftover A/C wire back there too I can check. MSD unused wires too mebbe. Dunno. ANNOYING can anyone w/ a wiring diagram tell me what things are shared on that circuit that would cause this? Weird it's blowing both lights... thanks guys, I appreciate it - electronics aren't my baaaag, baaaaby (actually, many / most things aren't some days it seems!) |
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Registered
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Blown fuse = dead short. Somehow you have earthed the wire to the low beams, maybe the retaining clip is touching where it should not? This is why the fuse does not blow when the H1's are hanging free.
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1972 911T Coupe with a '73E MFI engine and 'S' pistons 10 year resto mostly completed, in original Albert Blue. ***If only I didn't know now what I didn't know then*** |
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Banned
Join Date: Nov 2001
Location: top of 3rd
Posts: 4,336
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which retaining clip? The copper ground loop on the high beam up/down adjuster?
not sure how something would be touching each and ever time I've had the lights in / out (probably a dozen at this point now trying to resolve this) I know I have a short... but how to locate? thanks |
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Banned
Join Date: Nov 2001
Location: top of 3rd
Posts: 4,336
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got another multimeter
w/ both lo fuses installed and key / lights on - I've got 12v @ both low beam wires in the harness, and nothing @ ground hooked up left light and dangled it there - low works fine however when switch to hi's, the low glows grabbed the headlight, and went to set it into the bucket - ZAP... soon as it touched the car it blew the fuse I've exhausted the possibility of it being any of the dangling wires I've left from stuff that's been previously removed - they're all sufficiently addressed I looked in the bucket as I set the light in - nothing appears to be touching / grounding as it goes in can someone please try to help? I've exhausted everything in my knowhow... |
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Banned
Join Date: Nov 2001
Location: top of 3rd
Posts: 4,336
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In my ongoing fashion of answering my own posts... I just solved it.
Jamie... you get HALF A COOKIE! The H1 wires are unique, in that you cannot mess them up. Hi / Lo are differing lengths from the plug to the bulb so have to go 'that' way. The ground is the ground, it's not a spade like Hi / Lo... it's a wide flat wire w/ a hole to screw thru. So, nothing I did wrong there (or could). But, you DID get me a wundrin'... so I went back out and looked @ my JWest pigtails (to convert 4 prong harness to 3 prong light)... ...and I find JWest kindly PINNED THEM WRONG. How nice. Swapped the Lo / ground pins, and Bob's mah uncle. Thanks Jamie for steering me in the right direction... all's swell now... and... now on to 80/130w muwhaahahahaa 8-) (and turboPALOOZA tomorrow - yeeeeeeeeha!) |
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Registered
Join Date: Apr 2005
Location: AZ
Posts: 251
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I have an issue with the right side H1 high beam bulb blowing out. This is now the second time. The first one blew soon, the second took a lot longer to blow. Could it be a ground issue? Fuses are fine, just the bulb blows the filament and the bulb turns gray.
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Banned
Join Date: Nov 2001
Location: top of 3rd
Posts: 4,336
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stoopid question, but - are you sure your bulbs are clean (no finger prints) during install?
using name brand bulbs or Chinese crap? (no offense to any Chinamen)... sorry, that's all I gots... |
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Member 911 Anonymous
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Outstanding! Congrats.
That is why I check all replacement / upgrade parts before installation even my non-"Chinamen" stuff. My OEM Light Switch from the Porsche Dealer failed right out of the box, same with my brand new Bosch Fuel Pump. Quote:
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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Registered
Join Date: Jun 2002
Location: Texas
Posts: 1,396
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What are JWest pigtail adapters?
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Banned
Join Date: Nov 2001
Location: top of 3rd
Posts: 4,336
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^oh crap^
I go them from our host, along with my relay kit... it was a few months back, and apparently I confused the source and WRONGLY ASSUMED they were both of your sourcing. If so, a thousand public apologies! My bad. I was going from (limited and particularly damaged) memory. So, correction!: my PELICAN SUPPLIED PIGTAIL ADAPTERS were wrongly pinned! NOT JWest. this is them: Porsche 911 (1974-1989) - Lights and Lenses - Page 4 My JWest relay kit is installed and doing GREAT. Very sorry for my oversight! And thanks for the correction... |
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Registered
Join Date: Jun 2002
Location: Texas
Posts: 1,396
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Quote:
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Registered
Join Date: Apr 2005
Location: AZ
Posts: 251
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Hella H1 bulb, I did not touch the glass when installing. Second one that blew.
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