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light problems for 12 volt conversion

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Buster

12-03-2003 12:27:43

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I have looked everywhere I know to look, NAPA, AutoZone Etc. I cant find a light with a 194 bulb or one rated by BOB M in 12 volt conversion that goes in line from the alternator. Can I use and 1156 and regular socket and let it hang or how big a bulb can I use. Is a marker light to big. HELP!!

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steve

12-03-2003 19:18:43

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Re: light problems for 12 volt conversion in reply to Buster, 12-03-2003 12:27:43

i use a 10 ohm, 10 watt resistor from radio shack. cost is $1. it is aobut 2 inches long and 1/4 by 1/4 square. but a short terminal block with 3 or 4 sets of screws on it. attach to sheetmetal. connect risistor to two differrent screws, and your wires to the other side of the terminal screw. this is removable since not soldered. the big resistor will take the place of the diode and/or light. you can hardly burn out a resistor that big.

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Bus Driver

12-03-2003 15:37:54

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Re: light problems for 12 volt conversion in reply to Buster, 12-03-2003 12:27:43

The most durable device to use is a wirewound resistor. IH used a 25 ohm unit (now part#107 558 C1, formerly #534 784 R1) on their earliest alternator equipped tractors. I use a 5 watt 44 ohm with good results. The lamp (operating) resistance is probably a bit higher than these values- proves that the exact value is not critical.

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fred

12-03-2003 13:57:53

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Re: light problems for 12 volt conversion in reply to Buster, 12-03-2003 12:27:43

I used the one amp diode from radio shack. Works great.

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Bob M

12-03-2003 12:49:40

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Re: light problems for 12 volt conversion in reply to Buster, 12-03-2003 12:27:43

Buster - Use a #168 lamp instead. Any parts place will stock that (or you can pull one out of the side marker or dashboard in your car...) Also an 1815 and 1816 lamp will work.

An 1157 will likely NOT work! Resistance is too low - will make the alterator back feed the ignition coil and make it difficult to shut off the engine.

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old

12-03-2003 13:11:16

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Re: Re: light problems for 12 volt conversion in reply to Bob M, 12-03-2003 12:49:40

Bob, question is that bulb put it the field wire to stop it from back feeding so you can stop the engine??? If so why not just use a diode??

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Buster to Bob M

12-03-2003 13:00:30

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Re: Re: light problems for 12 volt conversion in reply to Bob M, 12-03-2003 12:49:40

Bob. Can the light just hang or where do or what do I ask for in reference to a socket or some way to mount it?

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Bob M

12-03-2003 13:46:45

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Re: Re: Re: light problems for 12 volt conversion in reply to Buster to Bob M, 12-03-2003 13:00:30

Buster - Depends on how fancy you want to go. In the past I've gone to Radio Shack and purchased a red pilot lamp holder and #1815 bulb. Mount the holder in a convenient spot, wire it up and you're set. Another way is to purchase a marker lamp assembly (includes the #168 or #1815 bulb) and mount/wire it in. But if you go this route you may have to modify the marker assembly to insure BOTH sides of the lamp are ungrounded. If one side of the lamp is grounded the alternator won't work. The cheap, all plastic marker lamps are best for this...

The cheapest route is to simply solder your wiring directly to the bulb terminals (no socket required). Then tape the bulb to the wiring and tuck it up under the hood someplace. Not recommended but I've done it and it works!

Another way is to get a 1 amp, 50 volt or higher rated diode and use it in place of the lamp. I forget which way to orient the band on the diode relative to the #1 alternator terminal. But you can figure it out quickly by trial and error - if the alternator doesn't charge, simply reverse the diode connections.

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Doug in OR

12-03-2003 19:12:31

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Re: Re: Re: Re: light problems for 12 volt convers in reply to Bob M, 12-03-2003 13:46:45

The band should be on the side facing the alternator. Go to Radio Shack and ask for a 1N4001, 1N4002, 1N4003 (the last digit is the voltage rating, in 100 volt multiples) diode. These are common diodes. As Bob said, you can wire direct, tho I prefer to put a resistor (27 to 47 ohms, 2 watt - ohm value is not critical) resistor in series with the diode. This is purely as protection. It acts as a current limiter and could save your diode if you develop a wiring short.

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Bob M

12-04-2003 04:56:52

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Re: Re: Re: Re: Re: light problems for 12 volt con in reply to Doug in OR, 12-03-2003 19:12:31

Good info - thanks Doug!

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