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Makotosun

1976 DT. 400

  • Jake2020
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Where does the the regulator rectifier mount on my 1976 DT 400.  It has one wire coming out -yellow with a white stripe.   I have heard it called a current limiter for the headlight 
18 Oct 2025 09:32 #1

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Replied by Gr8uncleal on topic 1976 DT. 400

That part is just the voltage regulator - there is a separate rectifier.

If the exploded parts diagram on Partzilla is accurate (not guaranteed!), then it fits somewhere near the horn - look for the corresponding yellow/white wire with a female bullet connector coming out of the main harness.
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18 Oct 2025 10:59 #2

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Replied by Lizeec on topic 1976 DT. 400

GR8UNCLEAL Is partially correct as the regulator is separate from the rectifier, the voltage regulator on a 1976 U.S.A model DT400C is mounted on the air box housing 
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18 Oct 2025 11:32 #3

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Replied by Gr8uncleal on topic 1976 DT. 400

Thanks for confirming. 

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18 Oct 2025 12:05 #4

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Replied by Jake2020 on topic 1976 DT. 400

Thank you for this info. It makes more since that it would be around the Air box because the Yellow female connector is back there.
and I found no Yellow./white stripe in the headlight bundle. Do you know if it needs to be grounded to metal or not?
by the Horn could work if they had a place to plug in there.
19 Oct 2025 09:42 #5

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Replied by Jake2020 on topic 1976 DT. 400

thank you for that lead.  I thought it should be by the horn,  but I can't find the yellow female lead up there.   BUT I did find the yellow female back by the airbox/Oil Tank coming out of the harness there/   I will check Partzilla too .  there are basically NO markings on this regulator, just a stamped Mitsubishi logo.  
19 Oct 2025 09:46 #6

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Replied by Gr8uncleal on topic 1976 DT. 400

Assuming no thick powder coating from a restoration, then the regulator should be earthed via it's attachment to the airbox, which is almost certainly not rubber mounted, so will be bolted direct to the frame.

The graphics have probably just been rubbed away over the years.
19 Oct 2025 10:13 #7

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Replied by Buggin on topic 1976 DT. 400

My 76 400 has it on the front side of the air box.
1976 Dt400
1985 RZ500
2001 Xr650L
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19 Oct 2025 10:19 #8

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Replied by MarkT on topic 1976 DT. 400

Pretty sure this is a pic of the regulator mount Yamaha added to airbox on the 76 DT400.

Someone could have replaced the airbox with an earlier version.

In any case, connect the reg wire to yellow and the regulator case must be grounded to frame.  On later bikes with plastic airbox, Yamaha ran a ground wire to one of the regulator mounting bolts.

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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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Last edit: 19 Oct 2025 10:45 by MarkT.
19 Oct 2025 10:22 #9

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Replied by Jake2020 on topic 1976 DT. 400

Thank you.  I will be able to figure it out now. 
20 Oct 2025 04:07 #10

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