Hi Beam wiring

Hello again folks,
Well another 3-4 days of unbelievably warm weather and I'm riding every chance I get. When it gets too cold again, I really want to fix an annoying problem with the headlight circuit and I was hoping for any sage advice from the wiring gurus on the board. The bike is an '82 Maxim 750.

The hi beam portion of the headlight isn't getting any juice. There IS power getting to the hi beam switch, which I tested with a simple current llight tester at the soldered connection in the switch. Also, the blue indicator light comes on when the hi position is selected.

The problem appears to be that this current is being lost inside the computer module or perhaps on the way to the computer module since there is no current available at the plug connection to the headlight itself.

Questions: I see no connectors on the wiring diagram between the hi beam switch and the computer, nor any between the computer itself and the headlight plug. Is this correct or are there connector plugs in there that I should be looking for?

Assuming that the open is actually IN the computer module, what are my options? Can I open up the module and look for a broken solder joint or other obvious problem or is the unit sealed and completely non servicable? OR, should I attempt to bypass the module and just wire the switch directly to the plug?

Any other options that I havn't thought of?

Many thanks in advance...

 

i dont know allot about wiring o.k nothing, i was thinking when i was reading your post could this be like a household bulb? a bulb that has two elements a high and low, the low works but the high is burnt out?? maybe its the headlight??

just a suggestion.

 

First thing I did was swap bulbs with a new H-4. When it didn't work, I knew it was a wiring problem. There is no power getting to the hi beam part of the plug that goes directly into the bulb.

 

maybe short in wire somewhere down the line, wire got crimped or squished, maybe sliced cassing and the wire is exposed touching frame.

 

This info is from a computer trouble-shooting guide off the XJCD, less the pictures!

Note: On the XJ750, no lights will come on before the engine starts.

Disconnect the 3-pin headlight coupler in the headlight bucket and check the voltages.
Hi beam: Yellow/Green to Black
Lo beam: Green/Red to Black
* Main switch is ON


If you get 12 volts – bulb is burnt out

Less then 12 volts continue….

Measure input voltage on the wire harness side through the 6-pin coupler in the headlight bucket.
Hi beam: Yellow to Ground
Lo beam: Green to Ground

If you get 12 Volts – Computer Module is faulty

Less then 12 Volts – Check the condition of the following parts:
Dimmer Switch
Starter Switch
Main Switch
Fuse

 

Thanks, Nick. I figured there had to be a connector to check somewhere. I'll probably get into this thing next week, but now I have a course of action.
Tim