Ehc will not power up

[Bhawkins854]

Had my transmission let loose on me last year, bike has been in pieces since then. Sent my trans to Andrew a few months ago and am finally in the process of trying to button everything up. I went to hook my battery up today and found nothing powers up. Checked battery voltage at 12.73 volts, battery has been on a tender. Ground cable to starter has been checked, crimps are ok. Pulled the key switch harness apart and jumped the pins to complete the ground the the ehc and nothing. Just ohmed out the wires from the key switch back to the ehc connector and also the battery positive and negative wires to the other ehc plug, pins are perfect still, dielectric grease is still intact. Anyone had this problem where the controller just goes out with no other issues leading up to it? Seems really strange that after it's been sitting it won't power up, never had any issues in the past with the ehc. Wondering if there's any further tests I can perform on the ehc before writing it off as a failure..

 

[BWG56]

Are ya sure you didn't forget a wire, and are you saying you don't even get head light?

 

[Bhawkins854]

Nothing what so ever. At first I thought I missed a wire but I checked and double checked. I feel like I'm missing a negative , only have my ground cable to the starter, and the negative running to the A connector on the ehc.

 

[chubs]

Is there not a ground cable from the neg. post on battery to the frame ? There has to be an open circuit somewhere. I agree with Ker .

 

[Bhawkins854]

I'm assuming the battery negative was connected at the starter for the frame ground, I had the upper bolt removed on the starter where it bolts to the inner primary so I hooked the battery - there..its been so long since I ripped it apart I can't quite recall. My fluke is giving me continuity from the battery negative the frame. Seems like I'm missing a fuse that is blown but there isn't one.

 

[Bhawkins854]

2.I'm leaving the wires to the horn disconnected until i get this figured out, I have the 4 awg battery negative wire that hooks to the starter mounting bolt and the negative to the ehc. I've been starting at the schematic and can't find anything missing

 

[Hirter6Pack]

I'm thinking if you're sure the key switch is working and all the wire are making a good connection and none of them are hiding from you I'd try and get a small pin and stab the positive wire going to the EHC in reference to ground. Do you have voltage?

 

[Bhawkins854]

I'm sure the key switch is ok, ground wire in the key switch circuit rings out good to ground as well. Only thing is wether or not the female pin on the switch leg side of the circuit is making good contact with the ehc pin..impossible to backprobe these connectors on the ehc, I could try to leave the A plug connected with battery power and jump the ignition return pin to ground with the B plug removed..reaching at straws though, everything worked just fine before removing the transmission.

 

[chubs]

I'm thinking if you're sure the key switch is working and all the wire are making a good connection and none of them are hiding from you I'd try and get a small pin and stab the positive wire going to the EHC in reference to ground. Do you have voltage?

Also, maybe check the ground wire right at the EHC to ground for continuity? Everything worked BEFORE pulling the tranny, nothing works AFTER replacing tranny. gotta be something simple that's being overlooked, kinda like Shannon's broken ring terminal that shut his ride down. In the meantime, I'll be scratching my head, and thinking about what it could be.

 

[Hirter6Pack]

I'd say you have a good as plan an any. Something in the key on power up circuit not making connection. You could send the EHC out to have it tested.

 

[Hirter6Pack]

Also, maybe check the ground wire right at the EHC to ground for continuity? Everything worked BEFORE pulling the tranny, nothing works AFTER replacing tranny. gotta be something simple that's being overlooked, kinda like Shannon's broken ring terminal that shut his ride down. In the meantime, I'll be scratching my head, and thinking about what it could be.

My thoughts exactly Chubs. Just doesn't make sense that the EHC would crap out all at one time with no signs of it doing so.

 

[BWG56]

Is the circuit breaker tripped? The circuit breaker is right above the horn with the 2 yellow terminals on it, it has a tiny black switch on the side of it

 

[bdm7250]

Is the circuit breaker tripped? The circuit breaker is right above the horn with the 2 yellow terminals on it, it has a tiny black switch on the side of it
View attachment 45221

Or if you've upgraded to a 40A fuse, has the fuse blown?

 

[BWG56]

Or if you've upgraded to a 40A fuse, has the fuse blown?
View attachment 45222

That's nice, were did ya get that idear? lol
Yep that's the update

 

[bdm7250]

That's nice, were did ya get that idear? lol
Yep that's the update
View attachment 45223

Hey you stoleded my idea...

 

[Bhawkins854]

There's a CB right above the ehc that is testing good, even if that were tripped or stuck open the ehc should still turn on. I'm now wondering why the ehc doesn't have a fused connection to the battery??? The battery + and - are both a straight shot to the ehc. Correct me if I'm wrong but

 

[BWG56]

There's a CB right above the ehc that is testing good, even if that were tripped or stuck open the ehc should still turn on. I'm now wondering why the ehc doesn't have a fused connection to the battery??? The battery + and - are both a straight shot to the ehc. Correct me if I'm wrong but

You are correct and it should be fused also, but you'll have to add a fuse link.

 

[Bhawkins854]

Only other thing to mention is that I stored the motocycle outside in my garage this winter. Last 4 years was stored stored in my basement where it's warm, couldn't keep it down there anymore because I recently finished it. I love in Minnesota..can't imagine the ehc shit out because of the cold weather?

 

[BWG56]

Your gonna laugh, but try this for real, heat the EHC up with a hair dryer and see if it comes to life, mine failed a cold test, if it got below 55*, it needed to get above 60* to come to life.

 

[chubs]

Uh oh! Sounds like yer gonna need to send the EHC out to be tested ! I don't think they like freezing weather any more than we do!


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