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Testing the headlight

07 Apr 2018 09:03
75SDDT400
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Testing the headlight #1
Hello all. So I have a quick question regarding the headlight on my 75 DT400. I'm in the process of bringing this bike back from the dead. I noticed today that my headlight is blown ( can see pieces of the filament inside).

Anyways, I have a new one on the way, but wanted to know if there's a way to test the headlight out of the bike, i.e directly from a battery. I know the headlight is run off of a/c voltage when installed on the bike, so I'm assuming the only true way to test it is installed with the bike running.

Can anyone confirm this?

Thank you.

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07 Apr 2018 09:32
MarkT
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Testing the headlight #2
Old fashioned incandescent (glowing filament) bulbs do not care one bit if they are run on AC or DC power. The 6 volt battery on the bike can be used to test.

You might consider installing a 6VAC voltage regulator... original Yamaha (came standard in 1976) or the one DEET recommends.

Here's a link to the "how to" for the Yamaha type:

yamaha-enduros.com/index.php/workshop/se...e-voltage-regulators

1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250

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07 Apr 2018 09:44
Makotosun
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Testing the headlight #3
+1 on a regulator.. the OEM bulbs are getting hard to find or are very expensive. You can aonvert to a 5 3/4” H4 conversion shell, then user 6 volt H4 bulbs which seem more available and are less expensive,

No Good Story ever started with a Salad . . .

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15 Apr 2018 16:54
75SDDT400
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Testing the headlight #4
Thank you for the reply guys. I was able to find a new headlight through Napa of all places, so I will be trying it shortly.
Every bulb on this bike is blown so I'm certainly going to look into a regulator. Hopefully I can find an inexpensive OE Yamaha one, as they seem to be the best option.

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16 Apr 2018 19:25
MarkT
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Testing the headlight #5
price on this one isn't too bad

1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250

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