Join Date: Apr 2008
Location: Beeville, TX
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2 things. 1, If you have several more feet of cable, then you need to get the next size larger cable. 2, you have a grounding problem. You need to ground to the cab body, the frame and the engine its self. If not, BAD THINGS *will* happen. You'd be surprised where it chooses to ground. Like through your antenna, up the transmission shift cable(and through your steering column), Through your transmission cooler, it'll surprise you in a really bad way. The reason why it won't start with the glow plugs running is that there is not enough ground to go around. While they are running, there is so much current, that the wimpy ground you do have is all used up by the glow plugs, and the IDM/PCM aren't able to ground. Once the glow plug system shuts off, it frees up enough that other things start working.
I would definitely go and get a big heavy cable, and run it from the battery to the engine, battery to the frame, then battery to body, then also frame to engine, engine to body. That covers all possibilities.
I had a friend's small block chevorlet that was not grounded properly when he installed an MSD. It grounded through this distributor gear and down the shaft that drives his oil pump. Fried the shaft and welded the oil pump solid. He thought he had blown the engine when the pressure dropped, the lifters started making horrible noises and such. We finally grounded it like I said before, and it solved the problem (and installed a new pump and shaft, new distributor, new MSD).
Eli Benson - EMT, Ambulance Mechanic
'08 F350 Dually KR - Spartan'd
'07 F250 CC SB 4x4 XLT - SCT /w Innovative Tunes
4 '09 & '10 E350 6.0l ambulances
1 '08 Duramax 6.6 (LMM) van ambulance