80 Series 1HDT Ground Locations

[CaptBeardilocks]

Hey All,

I’m working on finishing up the wiring on my 1HDT swap and need some assistance.

I’ve deleted the 24v start and have both batteries are grounded to the block. I’ve got a strap from the block to the frame.

Is there a ground from the head to the firewall like on the FZ?

Is the rear ground on the T-case to the body or the frame? Or does the manual transmission model not have the rear ground strap?

 

[simonliew]

The factory engine harness have a ground wire going to the left rear of the head where the lifting bracket is,and there’s a ground from one of the battery to body.
Every time I do an engine swap I always make sure there’s a ground strap from battery to engine ,engine to frame and frame to body, it can save a lot of headache,don’t ask why I know,being a mechanic for 30 yrs when diagnosing a no start on a Honda a broken ground wire can be a big problem.....

 

[logicbyondreaso]

The 1HDT has the following grounds:

• Engine wiring harness to head. Located by firewall and lifting hook. 10mm bolt secured it. There is another strap in same location that goes to the glow plug grounding bar.
• Block to battery and body. LH side below the IP and forward of the engine mount. If original, it's a single part cable that splits at the battery to go to body where it is secured inside the battery box on inner fender with a 10mm bolt. Just like the 1FZFE.
• Block to chassis. This cable is about 6-8" and is secured to the starter bolt and other end to the LH frame rail on top just forward of the firewall.

Engine harness to head:

Block to battery and body:

Block to chassis: