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Join Date: Nov 2000
Location: Longmont, Colorado
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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

Last edited by Brant; 09-02-2003 at 10:08 AM..
Old 09-02-2003, 10:06 AM
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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.

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Old 09-02-2003, 10:51 AM
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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
Old 09-02-2003, 05:51 PM
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