Need FI wiring Ideas (blows fuse)
 

Hello all,

I don't want to start another holy war, but can I just say how frustrated I've been trying to install this FI motor into a previously carbed car... Man I like the simplicity of my old carbed motor...

Anyways that is way off topic. I plopped a (72)1.7 motor into my ex-race car (74)chassis recently. Its all bolted in and plugged in. The motor used to run pretty well when it was in the 72 chassis last year.

I don't want to bore everyone, but the just of the problem is that everytime I turn the key on the Fuel pump runs for 1 second and then the 25# fuse on the regulator board blows, shutting off the pump (and I believe the coil also).

I've been chasing all of the circuts (heater blower/FI-auxilaries/coil/etc) and can't yet find out where the short is. The pump will run when jumped so I don't think its the pump. My best guess is something related to the relays on the board listed as: "main power" or "heater blower motor". I thought I would start over from square one.

The question part: Does anybody have any suggestions, or input. What items have people found that will blow this 25# fuse?

tia
brant

The Auxiliary Air Regulator. If the wire to it is touching the engine case (instead of being plugged in, or if the insulation is gone), or if the AAR has a dead short, the fuse will blow. The AAR is fed by the same signal that goes to the pump.

--DD

I second what DD says
 

Had a similar problem many years ago. One of the wires that runs under the AAR toward the dizzy had a bare spot and would intermittantly (sp?) short out the fuse you speak of. Check there first.

Pritchard